Please help me solve it WITHOUT THE USE OF A GRAPHING CALCULATOR OR ANY ONLINE TOOL.
Answers
Answer:
a) See attached (sorry if its a bit unneat, use 5 points for more accuracy while drawing. 3 points is generally accepted though.)
b) 80 mins
c) 4000 meters, 40 minutes
Step-by-step explanation:
First, lets define the literal meaning of the questions.
A) Graph the function (I will explain how to do below)
B) What is the absolute value of the distance of the x-intercepts?
C) What is the y value of the vertex (maximum/ minimum value). What is the x value of the vertex?
Lets solve these problems. To graph a quadratic equation by hand, first you must find the vertex. Formula for the x-value of the vertex:
[tex]\frac{-b}{2a}[/tex]
Because a quadratic equation is in the form:
[tex]ax^2 + bx + c = 0[/tex]
We can find the values of a and b.
Values of a and b in this equation:
a: -2.5
b: 200
Plug into the vertex formula (shown above), -b/2a
[tex]\frac{(-)(200)}{(2)(-2.5)}[/tex]
Simplify.
[tex]\frac{-200}{-5}[/tex]
Simplify.
-200/-5 = 40
Now we have 40, the x value of the vertex. Plug 40 back into the x values of the problem (t in this word problem) to find the y value of the vertex.
The equation:
[tex]h=-2.5t^2+200t[/tex]
Plug in 40 to the t values.
[tex]h = -2.5(40)^2 + 200(40)[/tex]
Simplify.
[tex]h = -4000 + 8000[/tex]
Add.
h = 4000
Now, we have the values of the vertex.
Values of vertex:
x: 40
y: 4000
This means that when the x-value is 40, the y-value is 4000. In this case, it means 40 minutes in, the altitude of the plane is 4000 meters.
On a graph, draw a point at x-value 40 and y-value 4000. This will be needed when we draw the graph.
We need at least 3 points to graph a quadratic equation (this applies to all parabolas.)
This part is a bit hard to explain, but you will get it with this example. Since we need 3 points, we need to solve for 2 more points like we just did. But what x-values do we use? For the vertex, we knew the x value was -b/2a!
Solve for x-values that have an equivalent absolute distance from the x value of the vertex.
For example, in this case, the x value of the vertex is 40.
If we were to pick the x value of 38 for the 2nd point, we would have to use the 42 for the 3rd point as they are both 2 away from 40.
|40-38| = 2
|40-42| = 2
I will use the x values of 38 and 42 to graph this. Lets do the same thing we did to find the y value of the vertex. Plug the x values into the equation individually.
Equation:
[tex]h=-2.5t^2+200t[/tex]
Plug in 38 to the x values (in this case its called t.)
[tex]h = -2.5(38)^2 + 200(38)[/tex]
Simplify.
h = -3610 + 7600
Add.
h = 3990
This means when the x value of the parabola is 38, the y value is 3990. In this case, it means after the plane has flown for 38 minutes, the altitude of the plane is 3990.
Now lets find what the y-value of the parabola would be when the x-value is 42 (when we've did this, we can graph it.)
But here is a little trick to speeden things up. If the absolute value of the difference of the x-value of the vertex (40 in this case) and the x value of the point we just found (38 in this case) is the same as the absolute value of the difference of the 3rd point we need to graph (42 in this case), which is always true if you followed the steps above, the y value is the same!
So, this means, when:
Point 2:
x: 38
y: 3990
Point 3:
x: 42
y: 3990
The y-value of the 3rd point we need to find is 3990.
Now we can graph it using our points.
Point 1 (Vertex):
x: 40
y: 4000
Point 2:
x: 38
y: 3990
Point 3:
x: 42
y: 3990
I'll just use paint to draw this, draw the points, label them, and connect the points with a parabola.
Now lets answer b using the definitions.
Because we need to find the x intercepts, lets use the quadratic formula.
[tex]\frac{ -b± \sqrt{b^2-4ac}}{2a}[/tex]
Ignore the A's, its a bug.
If you need to know how to use the quadratic equation, DM me. Otherwise, I will just write the x-intercepts.
x-intercepts:
0,80
Because it is asking for the distance between Toronto and Montreal in minutes, subtract 0 from 80.
80-0=80
B) 80 minutes
The maximum height of the aircraft is the y value of the vertex and the time that the aircraft reaches this height is the x-value of the intercept.
(Vertex):
x: 40
y: 4000
C) 4000 meters, 40 minutes
Answer:
a) See attached.
b) 80 minutes
c) Maximum height = 4000 m
Time = 40 minutes
Step-by-step explanation:
Given function:
[tex]h=-2.5t^2+200t[/tex]
where:
h is the height of the aircraft, in metres.t is the time, in minutes.Part a)The function is quadratic, which means the graph of the function is a parabola.
Axis of Symmetry
A parabola has perfect symmetry.
For a quadratic in the form [tex]ax^2+bx+c[/tex], its axis of symmetry is:
[tex]\boxed{x=-\dfrac{b}{2a}}[/tex]
Therefore, the axis of symmetry for the given function is:
[tex]x=-\dfrac{200}{2(-2.5)}=40[/tex]
Vertex
As the leading coefficient is negative, the parabola opens downwards.
Therefore, the vertex is the maximum point of the parabola.
The axis of symmetry is the x-value of the vertex.
Substitute t = 40 into the given function to find the y-value of the vertex:
[tex]\implies h(40)=-2.5(40)^2+200(40)[/tex]
[tex]\implies h(40)=4000[/tex]
Therefore, the vertex of the function is (40, 4000).
x-intercepts
To find the x-intercepts of the function, set the function to zero and solve for t:
[tex]\implies -2.5t^2+200t=0[/tex]
[tex]\implies -2.5t(t-80)=0[/tex]
Therefore:
[tex]\implies -2.5t=0 \implies t=0[/tex]
[tex]\implies t-80=0 \implies t=80[/tex]
Therefore, the x-intercepts are (0, 0) and (0, 80).
Graphing the function
Draw a coordinate plane where the axis scale is:
x-axis : y-axis = 1 : 100Plot:
Vertex = (40, 4000)Axis of symmetry: x = 40x-intercepts: (0, 0) and (0, 80)Draw a curve, symmetric about the axis of symmetry, that passes through the vertex and the x-intercepts.
Part b)When the aircraft is in Toronto and Montreal, the height of the aircraft is zero.
The time at which the height of the aircraft is zero is t = 0 and t = 80 (from part a). Therefore, the time it takes to fly from Toronto to Montreal is the difference between the two times:
[tex]\implies 80-0=80\; \sf minutes[/tex]
Part c)The maximum height of the aircraft is the y-value of the vertex of the parabola.
Therefore, as the vertex of the parabola is (40, 4000), the maximum height of the aircraft is 4000 m.
The maximum height is reached 40 minutes after the aircraft leaves Toronto.
Related Questions
the sat math scores of 1,000 future engineers and physicists are recorded. what will be the relationship between the mean and median of the collected data? think about if you would expect the distribution of sat math scores to be a normal distribution, skewed right distribution, or skewed left distribution.
Answers
The relationship between the mean and median of the collected data is that the mean will be smaller than the median.
Since the SAT Math scores for these students will be mostly high scores, the distribution will be skewed to the left. Thus, the few low scores (outliers) will make the mean smaller than the median.
Outliers that do not change the mean have an impact just on the mean. As a result, the mean is frequently lower than that of the median when the distribution of data is skewed to the left. The mean is frequently higher than the median when the distribution is tilted toward the right. We anticipate that the mean and median in symmetrical distribution will be about identical in value. This is a crucial link between the connection here between mean and median as well as the distribution's form. Nevertheless, it isn't applicable to all sets of data. Collections of data sets are where exceptions happen much more frequently.
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What’s the value of (a)?
Answers
Answer:
a=5
a=2x-5
Step-by-step explanation:
hope it helps
have a nice day!
or night
(-5,6)
(-3,3)
(-1,0)
(1,-3)
(3,-6)
Find the range of the relation.
(-6, -3, 0, 3, 6)
(-5, -3, -1, 1, 3)
(-6, -5, -3, -1, 0, 3, 6}
(-6,6)
Answers
The range of the given relation is (-6, -3, 0, 3, 6).
Range:
Basically the set contains 2 elements in it, in which set contains all the second elements, on the other hand, is known as the range of the relation.
Given,
Here we have the relation (-5,6), (-3,3), (-1,0), (1,-3) and (3,-6)
Here we need to find the range of the relation.
According to the definition of the relation,
Range refers the y values of the coordinates,
So, based on this the value of the given coordinates are extracted as,
(-5, 6) => 6
(-3, 3) => 3
(-1, 0) => 0
(1, -3) => -3
(3, -6) => -6
Now we have arrange the range values from the smallest to largest,
Therefore, the range of the relation is (-6, -3, 0, 3, 6).
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Doughnuts are sold in bags and cartons.
A bag holds 4 doughnuts and a carton holds 10 doughnu*
Tom buys B
bags of doughnuts and C cartons of doughnuts.
He buys a total of T doughnuts.
Write down a formula for T in
terms of B and C.
Answers
Answer:
Step-by-step explanation:
Answer:
b= c + t (the amount bought)
Step-by-step explanation:
The volume of this prism is 378 cm*.
What is the length of x?
27 cm*
Answers
Answer:14
Step-by-step explanation:All you have to do is Divide 378 by 27 to get x
Hope This Helps!
Francesca has 2615 comic books.
She wants to put them into groups of 8.
How many comic books would be left over
after putting them into groups?
Answers
Answer: 7 comic books would be left after putting them into groups of 8.
Step-by-step explanation: There will be 326 groups of comic books. 326 x 8 = 2,608 which means that there will be 7 comic books left after putting them all into groups of 8.
Justin wants to find the volume of a rectangular box. He starts by placing a layer of cubes in the bottom of the box (as shown).
Each cube has a length, width, and height of `1/2` inches. He continues placing cubes in the box until it is full. What is the volume of the box?
Answers
The volume of the given rectangular box is given by 225 cubic inches.
We know that the volume of the rectangular box with length L and width W and height H is given by,
V = LWH
So given the length of rectangular box is = 12 1/2 inches = 25/2 inches
The width of rectangular box is = 4 1/2 inches = 9/2 inches
The height of box is = 4 inches
So the volume of the rectangular box = (25/2)*(9/2)*4 = 25*9 = 225 cubic inches.
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I need help please!!!
Answers
The slope of the line that passes through (9, 1) and (-8, 2) is -1/17
How to find the slope?If we have a linear equation or a segment that passes through two points (x₁, y₁) and (x₂, y₂), then the slope is given by the formula:
slope = (y₂ - y₁)/(x₂ - x₁)
In this case, we know that the two points are (9, 1) and (-8, 2), using the above formula we can find the slope to be:
slope = (2 - 1)/(-8 - 9)
slope = 1/-17 = -1/17
That is the slope of the line or segment that passes through the given points.
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2[3x] = [1/2(4x+20)]2
Answers
Answer:x=10
Step-by-step explanation:
Answer:
x=10
Step-by-step explanation:
Multiply the numbers
2⋅3x=[12(4x+20)]⋅22⋅3=[12(4+20)]⋅2
6x=[12(4x+20)]⋅26=[12(4+20)]⋅2
Combine multiplied terms into a single fraction
6x=[12(4x+20)]⋅26=[12(4+20)]⋅2
6x=[1(4x+20)2]⋅26=⎣⎡1(4+20)2⎦⎤⋅2
Multiply by 1
6x=[1(4x+20)2]⋅26=⎣⎡1(4+20)2⎦⎤⋅2
6x=[4x+20/2]⋅26=[4+20/2]⋅2
Re-order terms so constants are on the left
6x=4x+20/2⋅26=4+20/2⋅2
6x=2⋅4x+20/2
Cancel multiplied terms that are in the denominator
6x=2⋅4x+20/2
6x=4x+20
Subtract 4x from both sides
6x=4x+20
6−4=4+20−4
Simplify
6x-4x=4x+20-4x
2x=4x+20-4x
Combine like terms
2x=20
Divide both sides by the same factor
2x=20
2x/2=20/2
cancel 2 on both sides
20 divided by 2 is 10
so therefore,
x=10
How do I solve this Quadratic expression by factoring?
Answers
Answer:
Step-by-step explanation:
Step-by-step explanation:
the highest exponent is 2, so, we expect to get 2 factors in x (as the multiplication of x×x = x²).
3 is a prime number, and the only factors to get 3 are 3 and 1
3 = 3×1
so, we expect to get factors that look like
(3x + a)(x + b)
when we do the multiplication, we get
3x² + 3bx + ax + ab = 3x² +(3b + a)x + ab
now we compare this to our original expression
3x² +(3b + a)x + ab = 3x² - 13x + 12
3b + a = -13
ab = 12
so, we know a and b must both be negative
(-×- = +, - - - = -).
the negative factors of 12 are
-12 × -1
-6 × -2
-4 × -3
which one of these pairs can make
3b + a = -13
be true ?
3×-12 + -1 = -37 no
3×-1 + -12 = -15 no
3×-6 + -2 = -20 no
3×-2 + -6 = -12 no
3×-4 + -3 = -15 no
3×-3 + -4 = -13 yes
so, our factors are
(3x - 4)(x - 3)
A dog kennel charges $40 for each night the dog stays in the kennel. Each day includes a 2 hour play time and
1 hour etiquette training. The kennel also charges a $10 bathing fee for a bath before the dog returns home.
Think of the linear function that demonstrates the cost of putting a dog in the kennel (c) in terms of the number
of nights (n)
Answers
Answer:
c=40n+10
Step-by-step explanation:
They charge 40$ per night from which we get 40n
The extra 10$ is from the bathing fee
The rest of the information they give us isn't useful in this case because they didn't ask us the cost per hour
Find two positive integers whose sum is 16 and the sum of squares is minimum.
Answers
x = 8 and y = 8 are the two positive numbers whose sum is 16 and the sum of the squares is minimum.
According to the question,
The two numbers are positive and the sum of the two numbers is 16 and the sum of the squares of the two numbers is the minimum.
Now to solve the question we will consider,
x and y are the two numbers, such that x > 0 and y > 0
Sum of the numbers : x + y = 16
Sum of squares of the numbers: S = x²+ y²
x + y = 16 y = (16 - x)
Assume, S = x² + y²
S = x² + (16 - x)²
Now we will differentiate with respect to x
dS/dx = 2x+ 2(16-x)(-1)
2x-2(16-x)=0
2x-32+2x=0
4x-32=0
4x=32
x=32/4
x=8
As x > 0, x = 8
d²S/dx² = d/dx [2x+ 2(16-x)(-1)]
d²S/dx² = d/dx (2x) - 2 d/dx (16-x)
d²S/dx² = 2 - 2[0-1]
d²S/dx² = 4
Now when x=8
d²S/dx² = 4 ≥0
Therefore, the function S = sum of the squares of the two numbers is minimum at x = 8.
y = 16-8 = 8
Therefore, x = 8 and y = 8 are the two positive numbers whose sum is 16 and the sum of the squares is minimum.
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Two trains are traveling at constant speeds on different tracks. Trains Train A is traveling 12.5 meters per second. What speed is Train B traveling? meters per second.
Answers
Train B is traveling faster because it traveled 100 meters in four seconds.
What is Average speed?Average speed is defined as the ratio of the total distance traveled by a body to the total time taken for the body to reach its destination.
We have to determine which train is moving faster based on the image.
We can tell by looking at the train speeds.
As per the formula,
distance/time = speed
Train A travels 12.5 metres in one second = 12.5/1 = 12.5 metres per second
Train B travels 100 meters in four seconds, hence its speed is 100/4 = 25 meters per second.
This is because it traveled 100 meters in four seconds, whereas train A covered 12.5 meters in one second.
Hence, train B is traveling faster.
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The question seems to be incomplete the correct question has been in attached file
suppose that among the 6000 students at a high school, 1500 are taking honors courses and 1800 prefer watching basketball to watching football. if taking honors courses and preferring basketball are independent, how many students are taking both honors courses and prefer basketball to football?
Answers
Students taking both honors courses and prefer basketball to football is 450.
Total number of students at a high school = 6000
Number of students who has taken honors courses = 1500
Number of students who prefer watching basketball to football = 1800
Let event of taking honors courses be A
and event of preferring watching basketball be B
P(A) = 1500 / 6000 = 0.25
P(B) = 1800 / 6000 = 0.3
If both the event of taking honors courses and preferring watching basketball is independent then
By using property of independent events ,
P(A∩B) = P(A) . P(B)
= (0.25)(0.3) = 0.075
Number of students taking both honors courses and prefer basketball to football = 0.075 × 6000
= 450 Students
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Use front-end estimation to place the decimal point in each answer. a) 32.47 6.75 2 5 7 2 b) 118.234 19.287 1 3 7 5 2 1 c) 17.9 0.8 1 7 1
Answers
Using front end estimation, the solutions to the given problems are;
1) 25.72
2) 137.521
3) 17.1
How to use front end estimation?
Front-end estimation is defined as a particular way of rounding numbers to estimate sums and differences.
The procedure for using front- end estimation, is to add or subtract only the numbers in the greatest place value. Thereafter, we add the decimals rounded to the nearest tenth.
1) 32.47 - 6.75
First of all, let's deal with the whole numbers part;
32 - 6 = 26
Next is to deal with the decimal part to get;
0.47 is approximately 0.5 while 0.75 is approximately 0.8. Thus;
0.5 - 0.8 = - 0.3
Thus, we have;
26 + (-0.3) = 25.70
Therefore, our given solution can be written as; 25.72
2) 118.234 + 19.287
First of all, let's deal with the whole numbers part;
118 + 19 = 137
Next is to deal with the decimal part to get;
0.234 is approximately 0.2 while 0.287 is approximately 0.3. Thus;
0.2 + 0.3 =0.5
Thus, we have;
137 + 0.5 = 137.5
Therefore, our given solution can be written as; 137.521
C) 17.9 - 0.8
First of all, let's deal with the whole numbers part;
17 - 0 = 17
Next is to deal with the decimal part to get;
0.9 - 0.8 = 0.1
Thus, we have;
17 + 0.1 = 17.1
Therefore, our given solution can be written as; 17.1
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Janet buys 4 bags of potatoes.
The first bag has 8 potatoes in it.
The second bag has 6 potatoes in it.
The third bag has 10 potatoes in it.
She has not yet counted the number of potatoes in the fourth bag.
To represent the total number of potatoes she has, Janet writes (8+6+10)
+x, where x is the number of potatoes in the fourth bag. Which expression
also represents the total number of potatoes Janet has?
2(4+3+5+x)
O 25+1+B)4x
O (8+6)(10+x)
O (8+6)+(10+x)
Answers
Answer:
(8+6)+(10+x)Step-by-step explanation:
2(4+3+5+x) Not valid since x represents the total number of potatoes in the fourth bag. The expression expands to (8+6+10 + 2x), not just x.25+1+B)4x Not valid as written, the expression has a new, undefined variable, B. Plus the 25+1 are not related to the actual inforamation. (8+6)(10+x) Not valid since there is no logic in multiplying the two expressions.(8+6)+(10+x) Valid: The expression can also be writte as 8+6+10+x, which matches the potatoe count in the four bags.Savio leaves his home 9.00 to drive to a work appointment. He drives a distance of 40miles.
Savio thinks he drives at an average speed of 60 miles per hour.
If Savio is correct what time will he arrive at his appointment
Answers
Answer:
9:40
Step-by-step explanation:
Distance = rate x time
Let t = time
40 = 60t Divide both sides by 60
[tex]\frac{40}{60}[/tex] = t An hour would be 60 minutes so the number of minutes out of the total would be 40.
An ostrich egg has a width of 12.9 cm to the nearest tenth of a centimeter. Find the minimum and maximum possible measurements.
Answers
The minimum measurement is 12.85 and the maximum measurement is 12.94 that would be equal to 12.9.
What is rounding of decimal numbers?
Look at the next digit in the correct position to determine how to round a number; if it is less than 5, round down, and if it is 5 or more, round up. The term "rounding decimals" describes the accurate rounding of decimal figures. To the nearest whole, tenth, or hundredth, we can round decimals.
Given, An ostrich egg has a width of 12.9 cm to the nearest tenth of a centimeter.
We have to find the minimum and maximum possible measurements.
If you're rounding to the nearest tenth of a centimeter, 12.85 centimeters is the smallest measurement that would equal 12.9 centimeters.
And 12.94 centimeters is the maximum measurement that would be equal to 12.9.
Therefore, the minimum measurement is 12.85 and the maximum measurement is 12.94.
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I need help please!!
Answers
Answer:
-5/3 or -1.67
Step-by-step explanation:
Answer:
-5/3
Step-by-step explanation:
Oh it's you again, I am just gonna copy paste my format from your previous question.
Use the slope formula: s=(y2-y1)/(x2-x1)
It doesn't matter the order.
Let's say -6 is x2 and 8 is y2; 3 is x1 and -7 is y1
Plug in the equation: s=[(8)-(-7)]/[(-6)-(3)]
Simplify and solve: s=[8+7]/[-9]
s = -15/9
s = -5/3
Do this thing please I will be very thankful
Answers
20/5=4
So 2x4=8
8/20 is the answer.
Then that means jessica is 3/ 5
So then if the total is 20 then the denominator has to be 20….
Causing dylan to be from 2/5 x4 on both sides to become 8/20
Translate this sentence into an equation.
Six more than the quotient of a number and 7 is equal to 9.
Answers
A company claims that the mean weight per apple they ship is 120 grams with a standard deviation of 12 grams. Data generated from a sample of 49 apples randomly selected from a shipment indicated a mean weight of 122. 5 grams per apple. Calculate and interpret a 95% confidence interval for the mean weight per apple.
Answers
The average apple weight's 95% confidence interval is (119.14, 125.86).
According to one manufacturer, an apple weighs 120 grams on average with a 12-gram standard variation. According to statistics generated from a sample of 49 apples randomly selected from a shipment, the average weight per apple was 122. 5 grams.
Let,
n = 49
x = 122.5
σ = 12
To figure up and analyze a 95% confidence interval for the average apple weight;
The formula for a 95% confidence interval is
(x ± 1.96*σ√n)
(122.5 ± 1.96*12/√49)
(119.14, 125.86)
Consequently, a 95% confidence interval for the average apple weight is (119.14, 125.86).
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The equation y = mx + b is used to express the equation of a line. Which solution is a correct way to solve this equation for x in terms of y?
Answers
By first subtraction b and then dividing by m, the solution of the linear equation for x is:
(y - b)/m = x
How to solve the linear equation for x?Here we have a linear equation that defines the variable y in terms of the variable x:
y = m*x + b
Where m and b are real numbers.
Now we want to find x in terms of the variable y, this means that we need to isolate the variable x.
if first we subtract b in both sides, we get:
y - b = m*x + b - b
y - b = m*x
If now we divide both sides by m, we get:
(y - b)/m = m*x/m
(y - b)/m = x
This is the linear equation solved for x.
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Answer:If you’re using imagine math it will be the the third one
Step-by-step explanation:
Which equation represents the line parallel to the line whose equation is 2y=4x+14
Answers
The parallel line has an equation of y = 2x + 3
How to determine the line equation?The equation is given as
2y = 4x + 14
Make y the subject
2y = 4x + 14
Divide through by 2
y = 2x + 7
The equation of a line can be represented as
y = mx + c
Where
slope = m
By comparing the equations, we have:
m = 2
This means that the slope of 2y = 4x + 14 is 2
The slopes of parallel lines are equal
This means that the slope of the other line is 2
i.e. m = 2
Recall that:
The equation of a line can be represented as
y = mx + c
Where
slope = m
So, we have
y = 2x + c
Assume any value for c
This gives
y = 2x + 3
Hence, the equation of the parallel line is y = 2x + 3
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Figure CC is the result of a transformation on Figure BB. Which transformation would accomplish this??????
Can someone please help me
(1). A translation 1 unit down
(2). A reflection over the y -axis
(3) A reflection over the x -axis
(4) A translation 1 unit up
Answers
Translation 1 unit up is the transformation which accomplish the graph.
What is Graph?Graph is a mathematical representation of a network and it describes the relationship between lines and points.
Given,
Figure C is the result of a transformation on Figure B
We need to find which transformation is used for this.
Graph transformation is the process by which an existing graph, or graphed equation, is modified to produce a variation of the proceeding graph.
and A vertical reflection reflects a graph vertically across the x-axis, while a horizontal reflection reflects a graph horizontally across the y-axis
Horizontally translating a graph is equivalent to shifting the base graph left or right in the direction of the x-axis.
The graph is just shifted slightly to right.
Figure B undergoes a translation of translation 1 unit up.
Hence translation 1 unit up is the transformation which accomplish the graph.
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b to the power of −6 times b to the power of 11
Answers
Answer: B^5
Step-by-step explanation: truss
4(y-4)=8
ANSWER WITH EXPLINATION PLEASE
Answers
Answer:
y=6
Step-by-step explanation:
4(y-4)=8
4×y-16=8
4×y=8+16
4×y=24
y=6
4(6-4)=8
4×2=8
How is p-value calculated with example?
Answers
To calculate the p-value, we have to follow the following steps:
First, identify the correct test statistic.Then, calculate the test statistic using the relevant properties of the sample.Specify the characteristics of the test statistic’s sampling distribution.Then, place test statistics in the sampling distribution to find the p-value.To calculate the p-value, we need
p = sample proportion
p' = assumed population proportion in the null hypothesis
n = sample size
Example
Given, n =40, σ = 32.17 and X = 105.37. calculate p-value.
σₓ = σ/ √n
σₓ = 32.17 / √40
= 5.0865
Now, by applying the test static formula, we get
t = (105.37 – 120) / 5.0865
t = -2.8762
Using the table, we find the value of P(t>-2.8762)
From the table, we get
P (t<-2.8762) = P(t>2.8762) = 0.003
If P(t>-2.8762) = 1- 0.003 = 0.997
P- value = 0.997 > 0.05
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Algbra 2 help please asap
Answers
Answer:
3√10 units
Step-by-step explanation:
[tex] \sqrt{250} = \sqrt{25 \times 10} = \sqrt{25} \sqrt{10} = 5 \sqrt{10} [/tex]
[tex]3x + 2x = 5 \sqrt{10} [/tex]
[tex]5x = 5 \sqrt{10} [/tex]
[tex]x = \sqrt{10} [/tex]
So the length of the longer piece is 3√10 units.
What is the maximum or minimum value of the function what is the range y=-2x^2+32x-12.
Answers
The maximum or minimum value of the function y = -2x² + 32x - 12 is (8, 116) and the range of the function y = -2x² + 32x - 12 lies in the interval
(−∞ ,116).
Given, the function is y = -2x2 + 32x - 12
According to the question we have to extract the maximum or minimum value of the function.
The maximum or minimum of a function which is a quadractic function occurs at the point x = -b/2a.
If a is negative, then the maximum value of the function is f(-b/2a).
If a is positive, then the minimum value of the function is f(-b/2a).
According to this, we can derive the general equation as
fmax(x) =ax²+bx+c occurs at x = -b/2a.
From the given equation, comparing we get
a = -2, b = 32, c = -12
Substitute the value of a and b in in the general equation and we get
x = -32/2(-2)
x = -32/-4
x = 8
Put x = 8 in the given general equation,
y = -2(8)² + 32(8) - 12
y = -2(64) + 256 - 12
y = -128 + 256 - 12
y = 256 - 140
y = 116
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