A retailer needs to purchase 12 printers. The first printer costs $54, and each additional printer costs 5% less than the price of the previous printer, up to 15 printers. What is the total cost of 12 printers?.
The total cost of 12 printers is; $493.41
Cost of first printer; C1 = $54
Cost of second printer is; 95% × 54 = $51.3
Cost of third printer is; 0.95 × 51.3 = $48.735
Cost of fourth printer = 0.95 × 48.735 = $46.298
Now, let us apply same pattern using a calculator for the remaining costs and we will have them as follows;
Cost of 5th printer = $43.983
Cost of 6th printer = $41.784
Cost of 7th printer = $39.695
Cost of 8th printer = $37.710
Cost of 9th printer = $35.825
Cost of 10th printer = $34.033
Cost of 11th printer = $32.332
Cost of 12th printer = $30.715
Total cos is; 54 + 51.3 + 48.735 + 46.298 + 43.983 + 41.784 + 36.695 + 37.710 + 35.825 + 34.033 + 32.332 + 30.715 = $493.41
Therefore, the total cost of 12 printers is $493.41
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Really need help!
Graph the equation y =x²
+ 4x - 5 on the accompanying set of axes. You must plot 5 points including the roots and the vertex. Using the graph, determine the roots
of the equation x² + 4x − 5 = 0.
Answer:
See picture below
Step-by-step explanation:
Use Desmos the free calcualtor.
Mrs. Nicholas baked two batches of cookies. The first batch consisted of 120 gingerbread cookies and the second batch consisted of 150 shortbread cookies. Mrs. Nicholas saved the same fraction of cookies from each batch. If Mrs. Nicholas saved 20 more shortbread cookies than gingerbread cookies, what fraction of the cookies did she save?
Answer:
i think 2/15 of the cookies
Step-by-step explanation:
hope this helps
STATISTICS The most familiar statistical measure is the arithmetic mean, or average. A second important statistical measure is the standard deviation, which is a measure of how far the individual scores are from the mean. For example, the mean score on the Wechsler IQ test is 100 and the standard deviation is 15. This means that people within one deviation of the mean have IQ scores that are 15 points higher or lower than the mean.
An absolute value equation that can be used to find the maximum and minimum scores within one standard deviation of the mean is |x - 20.9| = 5.3.
The minimum score that is within one standard deviation of the mean is equal to 15.6.
What is an absolute value function?In Mathematics, an absolute value function can be defined as a type of function that consist of an algebraic expression, which is placed within absolute value symbols and measures the distance of a point on the x-coordinate to the x-origin (0).
Mathematically, an absolute value function can be represented by this mathematical expression:
|x| = x, x ≥ 0.|x| = x, x < 0.Since the standard deviation is 5.3 and the mean is 20.9, an absolute value equation for the scores that is within one standard deviation of the mean is given by:
|x - 20.9| = 5.3.
x - 20.9 = ±5.3
Evaluating the absolute value function, the maximum score is given by:
x - 20.9 = 5.3
x = 20.9 + 5.3
x = 26.2.
Evaluating the absolute value function, the minimum score is given by:
x - 20.9 = -5.3
x = 20.9 - 5.3
x = 15.6.
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Complete Question:
The most familiar statistical measure is the arithmetic mean, or average. A second important statistical measure is the standard deviation, which is a measure of how far the data are from the mean. For example, the mean score on the Wechsler IQ test is 100 and the standard deviation is 15. This means that people within one standard deviation of the mean have IQ scores that are 15 points higher or lower than the mean. One year, the mean mathematics score on the ACT test was 20.9 with a standard deviation of 5.3. Write an absolute value equation to find the maximum and minimum scores within one standard deviation of the mean. Use your equation to find the minimum score that is within one standard deviation of the mean
a wheat farmer is investigating the effectiveness of a treatment for controlling a pest. a random sample of 500 plants shows that 47 of them are infected by the pest. what does this sample indicate about the claim that 20% of the plants are infected?
The sample indicates that the data does not provide sufficient evidence to support the claim that 20% of plants are infected.
This given test is a test for single sample proportion
The test hypothesis are:
[tex]H_{o} :p=0.20[/tex], null hypothesis
[tex]H_{1} :p\neq 0.20[/tex], alternative hypothesis
The test statistic fallows a standard normal distribution and is given by:
[tex]Z=\frac{x-p}{{\sqrt{p(1-p)/n} } }[/tex]
p=0.20
X=47 plants
Sample size, n=500
x, is the sample mean:
x=X/n=47/500
x=0.094
So, test statistic is calculated as:
[tex]Z=\frac{0.094-0.20}{\sqrt{0.20(1-0.20)/500} }[/tex]
Z=-5.93
From the z-table, the p-value associated with Z=-5.93 is approximately 0
The decision rule based on p-vale, is to reject the null hypothesis if p-value is less than confidence level
In this case, the p-value is very small and less than confidence level of 0.20, we therefore reject the null hypothesis or the claim
So we conclude that the data does not provide sufficient evidence to support the claim that 20% of plants are infected.
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if -3 + i is a root of the polynomial function f(x), which of the following must also be a root of f(x)?
Answer:
-3 - i
Step-by-step explanation:
This is true, because when solving for an imaginary solution through a polynomial, the form A ± Bi will always be adhered. A and B are both constants.
(Constants are just any real number, like 1, 2.35, or [tex]\frac{1}{2}[/tex].)
PLEASE HELP, QUESTION IN THE PICTURE
Step-by-step explanation:
AC is the combination of AB and BC.
so, AB + BC = AC
(2n - 1) + (4n + 5) = 10n - 12
2n - 1 + 4n + 5 = 10n - 12
6n + 4 = 10n - 12
4 = 4n - 12
16 = 4n
n = 4
Which of the following is not an isometry
A). Translation
B). Line reflection
3). Point reflection
4). Rotation
The option that is not an isometry from the given transformations is 3). Point reflection.
What is an isometry?An Isometry refers to a transformation that leads to the distance and length of a shape being preserved when it is transformed.
Translations and rotations preserve the shape of a figure during transformation which means they preserve length which makes them an isometry. The same is true of line reflections.
Point reflections on the other hand, will lead to a change in dimensions for the figure being transformed.
In conclusion, `a point reflection is not an isometry.
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write a linear function f with the given values. f(-10) = 4, f (8) = -5 Can someone please help me with this question
Answer: y=-0.5x-1
Step-by-step explanation:
y=mx+b
Convert the given values f(-10) = 4, f (8) = -5 to coordinates (-10,4) (8,-5)
Hence we use the formula for finding the slope m:
[tex]\displaystyle\\\boxed{m=\frac{y_2-y_1}{x_2-x_1} }\\\\x_1=-1\ \ \ \ \ x_2=8\ \ \ \ \ \ y_1=4\ \ \ \ \ y_2=-5\\\\m=\frac{-5-4}{8-(-10)}\\\\m=\frac{-9}{8+10} \\\\m=\frac{-9}{18} \\\\m=-0.5\\\\Thus, y=-0.5x+b\ \ \ \ (1)\\\\[/tex]
We substitute the value of (-10,4) into equation (1):
[tex]4=-0.5(-10)+b\\\\4=5+b\\\\-1=b\\\\Thus, b=-1[/tex]
Hence, y=-0.5x-1
Beatrice makes a jar of dry soup mix. The ingredients are:
1 3/4 = 7/4cups uncooked rice
1/2 cup dry lentils
1 2/3 = 5/3 cups uncooked pasta
1/3 cup beef bouillon
1/4 cup dried onion flakes
1/2cup dried peas
How much soup mix does this recipe make?
Answer the questions to find out.
The sum 7/4+ 1/2+5/3 +1/3 +1/4 +1/2 gives the amount of mix.
1. Which property could you use to change the grouping of the addends?
The soup mix that this recipe makes is 5.
The property could you use to change the grouping of the addends is the associative property of addition.
How to calculate the value of the mix?From the information, the following can be deduced:
7/4cups uncooked rice
1/2 cup dry lentils
1 2/3 = 5/3 cups uncooked pasta
1/3 cup beef bouillon
1/4 cup dried onion flakes
1/2cup dried peas
The soup mix that this recipe make will be the addition of all the values. This will be:
= 7/4+ 1/2+5/3 +1/3 +1/4 +1/2
= 5
The associative property of addition can change the grouping.
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suppose weights of the checked baggage of airline passengers follow a nearly normal distribution with mean 45 pounds and standard deviation 3.2 pounds. most airlines charge a fee for baggage that weigh in excess of 50 pounds. determine what percent of airline passengers incur this fee.
In most of the cases airlines charges a fees for baggage weigh in excess of 50 pounds. Then about 94.06% passengers incur this fees.
When the distribution is normal, we use the z-score formula.
In a set with mean and standard deviation , the z-score of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
Given That,
Mean (μ) = 45 pounds and Standard Deviation (σ) = 3.2
This means that μ = 46 , σ = 3.2
Since, Most airlines charges a fee for baggage that weigh in excess of 50 pound.
Then, As a proportion this is 1 subtracted by the P - value of Z when
X =50. So,
Z = X - μ / σ
⇒ Z = 50 -45/ 3.2
⇒ Z = 5/3.2
⇒ Z = 1.56
when Z = 1.56 has a P- value of 0.9406
Now, 0.9406 × 100%
= 94.06%
Therefor, 94.06% of airline passengers incur this fees.
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8x1 4* 28 × +8 help me
Answer:
8x1 4* 28 × +8 = 28x + 12
8x^1 + 4 times 28 + 8
Add common Factors which are 8x and 28x added they equals 36x and 4 and 8 which equals 12 so now we got 28x + 12 and that is the answer
PLEASE GIVE BRAINLIEST THANK YOU!!!
Valentina measured a kitchen and made a scale drawing. She used the scale 1 inch : 2 feet. A countertop in the kitchen is 2 inches wide in the drawing. How wide is the actual counter?
The actual width of the countertop is 4 feet
Given,
Valentina measured a kitchen and made a scale drawing;
The scale she used for the drawing = 1 inch ; 2 feet
The width of countertop of kitchen in drawing = 2 inches.
We have to find the actual width of the countertop;
Here,
The scale factor used in the drawing = 1 inch = 2 feet
1 inch = 2 feet
2 inch = 2 x 2 = 4 feet
Now,
The actual width of the countertop = Width in drawing x 2
= 2 x 2 = 4 feet
That is,
The actual width of the countertop is 4 feet
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Help please
I need this by tomorrow
Answer:
I hope this will help. Tip: reuse the formula!
Greg mow and rakes lawn to earn extra money He makes 45 for every lawn he mows and an extra 15 for raking his goal is to earn at least 250 per week
The inequality is 45m + 14 n ≥ 250.
What is Inequality?Mathematical expressions with inequalities are those in which the two sides are not equal. Contrary to equations, we compare two values in inequality. Less than (or less than or equal to), greater than (or greater than or equal to), or not equal to signs are used in place of the equal sign.
Given:
He makes 45 for every lawn he mows
and an extra 15 for raking
His goal earning= at least 250 per week
let the number of lawn he mow is m and the number of lawn rakes is n.
Then the inequality is
45m + 14 n ≥ 250
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: in a random sample of 20 people, what is the probability that 2 are 65 years or older, 5 are 55-64 years old, 6 are 25-54 years old, 4 are 15-24 years old and 3 are 0-14 years old?
the probability that 2 are 65 years or older, 5 are 55-64 years old, 6 are 25-54 years old, 4 are 15-24 years old and 3 are 0-14 years old IS 0.24243
the complete question is:
The demographic profile of Ecuador in 2018 is • 27.08% of the population are 0–14 years old • 18.35% are 15–24 years old • 39.59 are 25–54 years old • 7.53% are 55–64 years old • 7.45% are 65 years and older. In a random sample of 20 people, what is the probability that 2 are 65 years or older, 5 are 55–64 years old, 6 are 25–54 years old, 4 are 15–24 years old and 3 are 0–14 years old?
answer:
P(x) = P(x=2) + P(x=5) +p(x=6) +p(x=4) +p(x=3)
=20[tex]C_{2}[/tex][tex](7.45)^{2}[/tex][tex](2.55)^{18}[/tex]+20[tex]C_{5}[/tex][tex](7.53)^{5}[/tex][tex](2.47)^{15}[/tex]+20[tex]C_{6}[/tex][tex](39.59)^{6}[/tex][tex](0.41)^{14}[/tex]+20[tex]C_{4}[/tex][tex](18.35)^{4}[/tex][tex](1.65)^{16}[/tex]+20[tex]C_{3}[/tex][tex](27.08)^{3}[/tex][tex](2.92)^{17}[/tex]
P(x) = 0.2424
the probability that 2 are 65 years or older, 5 are 55-64 years old, 6 are 25-54 years old, 4 are 15-24 years old and 3 are 0-14 years old IS 0.24243
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Amadou and his children went into a grocery store and he bought $9 worth of apples and bananas. Each apple costs $1 and each banana costs $0.50. He bought 4 times as many apples as bananas. By following the steps below, determine the number of apples, x, and the number of bananas, y, that Amadou bought.
Determine THREE ways to have 4 times as many apples as bananas.
There are 3 other ways so please try to answer them!
An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.
The number of apples is 8.
The number of bananas is 2.
What is an expression?An expression is a way of writing a statement with more than two variables or numbers with operations such as addition, subtraction, multiplication, and division.
Example: 2 + 3x + 4y = 7 is an expression.
We have,
Total cost = $9
Cost of one apple = $1
Cost of one banana = $0.50
The number of bananas = x
The number of apples:
y = 4x
Now,
1y + 0.50x = 9
4x + 0.50x = 9
4.50x = 9
x = 9/4.50
x = 2
Now,
y = 4 x 2 = 8
Thus,
The number of apples 8.
The number of bananas is 2.
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Change the following problem to an addition problem.
-5-4
Answer:-9
Step-by-step explanation:
-(5+4)
-(9)
Image is the equation
Answer:
y = [tex]\frac{3}{4}[/tex] x + 8
Step-by-step explanation:
the equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
here m = [tex]\frac{3}{4}[/tex] , then
y = [tex]\frac{3}{4}[/tex] x + c ← is the partial equation
to find c substitute (- 4, 5 ) into the partial equation
5 = - 3 + c ⇒ c = 5 + 3 = 8
y = [tex]\frac{3}{4}[/tex] x + 8 ← equation of line
for each pair of points, find the slope of the line that passes through both points. If you get stuck, try plotting the points on graph paper and drawing the line thoruhg them wiht a ruler
The slope of points (1,3) and (4,5) will be 2/3.
What is a slope?Slope or the gradient is the number or the ratio which determines the direction or the steepness of the line. The slope is also defined as the ratio of the rise and the run of the line.
Given that the line is passing through points (1,3) and (4,5). The slope of the line will be calculated as,
Slope = ( y₂ - y₁ ) / ( x₂ - x₁ )
Slope = ( 5 - 3 ) / ( 4 - 1)
Slope = 2 / 3
Therefore, the slope of points (1,3) and (4,5) will be 2/3.
The complete question is given below.
Find the slope of the line that passes through both points (11,3) and (4,5).
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sarah gets pocket money every week from the age of 5 until her 21st birthday and is given a choice of 2 options options .
option 1:get the same number of pounds each week as her age.
option 2 : get 5 pounds a week aged 5 and increasing by 15% a year.
which option should Sara choose ?
please help
The option that Sarah should choose is option 2.
Which option should Sarah choose?
Sarah would choose the option that give her the higher amount of money at her 21st birthday.
The amount that Sarah would earn each year with option 1 would increase at a linear rate. This is because she gets the same amount of money each year.
The form of a linear equation is y = mx + b
Where:
m = slope b = interceptThe amount that Sarah would earn each year with option 2 would increase at an exponential rate.
The general form of exponential equation is f(x) = [tex]e^{x}[/tex]
Where:
x = the variable e = constantThe rate of growth with an exponential function is faster than that of a linear function. It is for this reason that option 2 is the better option.
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Please help
What equation is represented by the values in this table
Answer:
y=2x-2
Step-by-step explanation:
use y2-y1/x2-x1 to find slope
4-2/3-2
2/1
2 is the slope
A and B are the only possible answers so far
Now to find y intercept
We know it can’t be +2 because at 2 x is equal to 2 so -2 is the only option
Hopes this helps please mark brainliest
How do this?Help pls give answer
Answer:
Step-by-step explanation:
Ok! So apparently I think you are learning about pre algebra. So the questions are saying what times 1/4=8 in that case it would be x = 32. x is just a fancy way to say you don’t know what it is.
what is 6,000 lb/day = ____ t/wk?
Answer: 21 tons/wk
Step-by-step explanation:
6000 lb/day = 3 tons/day
3 t/day * 7 = 21 t/wk
4. Find x.
xº
78°
65°
This is problem number 4
I will mark brainless if I get this question right when I turn it in
The answer would be 78 degrees, or 70 degrees
What is the next fraction
in this sequence?
Simplify your answer
5/14, 3/7, 1/2, 4/7 …
Solve this system of equations using the SUBSTITUTION method, then answer the questions below.
x + 2y = 4
3x + 6y = 18
What did you get for the (x, y) solution to this system? If you were to graph these equations, would their lines cross? Explain why or why not.
The x and y do not have the values in the equation because both the equations don't intersect each other.
given that the equation,
x + 2y = 4 ..........i
3x + 6y = 18 ...........ii
now multiply i with 3 and subtract with from ii,
3x + 6y = 18
-(3x + 6y ) = 12
0x + 0y = 6
which is not possible so x and y do not have the values at the intersection of the both equations which states that both the equation do not intersect at each other.
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which choice does not determine the sampling distribution? the population size the population variance the population mean the sample size
The population size does not determine the sampling distribution.
In the give question we have to find which choice does not determine the sampling distribution.
We firstly learn more about sampling distribution
A sampling distribution is a probability distribution of a statistic that is derived from a bigger sample size of individuals chosen at random from a given population. The sampling distribution of a particular population is the distribution of frequencies of a variety of potential outcomes for a population statistic.
So, the population size does not determine the sampling distribution.
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What does 25 DIVIDE by 3 equal?
Step-by-step explanation:
25/3 = 8.33
hope it's helpful
A car moves at a speed of 80km/h from P at 0800 hours and reaches Q at 0930 hours. A lorry takes the same route from Q at 0800 hours to P at a speed of 70km/h. At what time do both vehicles meet?
The vehicles will meet at 0845 at a distance of 64 km from P when they move at the respective speeds.
The car moves at a speed of 80km/h from P to Q and it takes time t
t = 9.30 - 8.00 = 1 hour 30 minutes or 1.5 hours
Distance covered = speed × time
Distance = 80 × 1.5 = 120 km
Now et the cars meets at a distance of x km from P.
times taken by the car to cover x km = x/80 hours
The lorry travels 120 - x in that same time.
time taken = 70/(120 - x)
Now the time taken must be equal.
Therefore we will form an equation to calculate x.
(120 - x) / 70 = x / 80
or, 960 - 8x = 7x
or, 15x = 960
or, x = 64
Therefore the cars will meet at 64 km from P.
Now time taken by the car to cover 64 km = 64/80 = 0.8 hours = 48 minutes
Hence the cars will meet at 0845 hours.
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