Q21.
A delivery company has a total of 160 cars and vans.
the number of cars: the number of vans = 3:7
Each car and each van uses electricity or diesel or petrol.
of the cars use electricity.
25% of the cars use diesel.
The rest of the cars use petrol.
Work out the number of cars that use petrol.
You must show all your working.

The sales tax is $2 and the total cost of the item is $42.

Given:

selling price = $40

rate of sales tax = 5%

sales tax = 40*5%

= 40*5 / 100

= 200/100

= $2

Total cost = 40+2

= $42.

Therefore the sales tax is $2 and the total cost of the item is $42.

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Since the first child is a boy, this means we need to find the probability of another boy. This is 1/2 since we assume each gender has the same chance of happening.

Answer:

25%

Step-by-step explanation:

The amount of chocolate left is three and seven-twelfths pounds

The amount of chocolate left is found by addition and subtraction of fraction

The fraction required are:

Eva bought seven and one-half pounds of chocolate chips = 7 1/2

She used three and three-fourths pounds = 3 3/4

two and five-sixths pounds in some muffins = 2 5/6

total amount used = addition of amount used

3 3/4 + 2 5/6

= 3 11/12

the amount left is gotten by subtraction of amount used from amount Eva bought

= 7 1/2 - 3 11/12

= 3 7/12

this is three seven-twelfths

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Answer:

9(x+4)= 6

Step-by-step explanation:

I could be wrong but im not sure

The common difference of the arithmetic sequence -13, -22, -31, is -9.

An arithmetic sequence is a set of numbers that are ordered and have a common difference between each consecutive term. In the arithmetic sequence 3, 9, 15, 21, 27, for example, the common difference is 6. An arithmetic progression is another name for an arithmetic sequence.

To find a specific term in an arithmetic sequence, we use the nth term formula. Step 1: An = a + (n - 1)d gives the nth term of an arithmetic sequence.

Some arithmetic sequence examples using this expression are:

1, 5, 9, 13, 17, 21, 25, 29, 33, ...

2, 4, 6, 8, 10, 12, 14, 16, 18,...

In this case, the difference will be:

= 2nd term - 1st term

= -22 - (-13)

= -22 + 13

= -9

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Answer:The area A of a rectangle is represented by the formula A=lw where l is the length and w is the width. The length of the rectangle is 5.

Write an equation that makes it easy to find the width of the rectangle if we know the area and the length.

Step-by-step explanation:

Answer:

100°

Step-by-step explanation:

The sum of any polygon angles add to  ( n-2)(180)   where n is the number of sides ......for a quadrlateral    ( 4-2)(180 ) = 360

60 + 90 + 110 +  x = 360    shows    x = 100 °

Answer:

sin75^°-sin15^°=1/√2

The values of the variables "a", "b", and "c" are 3.06, 169.74, and 0, respectively. The total amount Gary will pay is $769.74.

Gary purchased a S750 TV on a credit card with a 22% annual percentage rate, and he wants to pay it off in payments of $200 per month. The table shows the information for the first four months after Gary used his credit card. We need to calculate the values of the missing variables and the total amount he will pay.

The variable "a" is the interest charged on the left amount in the third month.

a = (366.68 - 200)*0.018333 = 3.06

The variable "b" is the monthly amount paid by Gary. It is less than or equal to $200, depending on the payment amount. Since the amount to be paid is $169.74, which is less than $200, he will pay the whole amount in one go.

b = 169.74

The variable "c" is the interest charged on the left amount in the fourth month. Since then, the entire amount has been paid.

c = 0

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The probability that their next (third) child will have extra digits is 0.5

Polydactyly refers to the presence of extra fingers in the human body. It is a hereditary condition that is passed down from parents to children. The thumb, middle, and little fingers are the most commonly affected by this condition. Polydactyly refers to the presence of extra fingers in the human body. It is a hereditary condition that is passed down from parents to children. The thumb, middle, and little fingers are the most commonly affected by this condition.

A trait is a distinguishing characteristic that a person possesses. Dominant traits are defined as having only one copy of a gene on a chromosome that expresses a specific trait.

Individuals exhibit the dominant traits most prominently. Polydactyly is the dominant condition in this case.

The father has six fingers and six toes, while the mother is in normal condition. In this particular condition, polydactyly is a dominant trait. Twelve percent of the couple's children are expected to have extra digits.

Because the father has the dominant trait and the mother is in normal condition, there is a 50% chance that this deformity will be passed down to children.

The probability that their next child will have extra digits is 0.5

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The equation of the trend line in the scatter plot is y = - 4x + 24

What is the slope-intercept form?

Writing the equation of a line in the slope-intercept form simply makes the slope (steepness) and y-intercept (where the line crosses the vertical y-axis) obvious.

Here, we have

The yellow points are located at points (6, 0) and (4, 8)

For a linear equation that passes through the points (x₁, y₁) and (x₂, y₂), the slope is:

s = (y₂ - y₁)/(x₂ - x₁)

Then, for the equation, the slope is

s = (8-0)/(4-6) = -4

Then the linear equation become

y = -4x + b

where b is the y-axis intercept.

To find b, we use that when x = 6, y = 0

0 = 6×(-4) + b

b = 24

Then equation become y = - 4x + 24

Hence, the equation of the trend line in the scatter plot is y = - 4x + 24

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the 4.3 represents The number of apples in 1 pound

The 4.3 in the equation represents the number of apples in 1 pound

The solution of an equation refers usually to the values of the variables involved in that equation which if substituted in place of those variable would give a true mathematical statement.

We are given equation y = 4.3x can be used to determine the total cost, y, in dollars, of x pounds of apples.

Here we can see that y = 4.3x

4.3 = y/x

then we can say that 4.3 is slope of striaght line in term os linear equation.

4.3 in the equation represents the number of apples y, in dollars, of x pounds.

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Using the Law of Cosines, the value of x is 40.9°.

Cosine formula, cos A [tex]=\frac{b^{2}+c^{2}-a^{2} }{2bc}[/tex].

Here, A = x

          a = 16

          b = 15

          c = 24

cos x [tex]=\frac{15^{2}+24^{2}-16^{2}}{2*15*24}[/tex]

         [tex]=\frac{225+576-256}{720}[/tex]

         [tex]=\frac{801-256}{720}[/tex]

         [tex]=\frac{545}{720}[/tex]

         = 0.756

x [tex]= cos^{-1}0.756[/tex]

 = 40.9

Hence, value of x is 40.9°.

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From the given data , equation which can be formed to get the value of y that is the total amount of flour Otto used in his recipe is given by :

y = x + 5.5

With the constraints x and y where,

 x is any real number ≥ 0,

 y is any real number ≥ 5.5

As given in the question,

Number of cups of wheat flour used by Otto  = 5.5.cups

Number of cups of white flour used by Otto = x cups

Let y represent the total amount of flour used by Otto in the recipe

Required equation  to represent the total amount of flour used by Otto in the recipe is given by :

y = x + 5.5

Where x is any real number which is greater than or equal to 0.

As cups of flour can be in fractions.

And y is any real number which is greater than or equal to 5.5.

As y = x + 5.5, and x ≥0 and cups of flour can be in fractions.

Therefore, from the given data , equation which can be formed to get the value of y that is the total amount of flour Otto used in his recipe is given by :

y = x + 5.5

With the constraints x and y where,

 x is any real number ≥ 0,

 y is any real number ≥ 5.5

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Answer: 44

Step-by-step explanation:

since OPN and RPQ are similar triangles, you can use ratios to find their sides

[tex]\frac{24}{15} =\frac{x}{15+12.5}[/tex]  or  [tex]\frac{24}{15} =\frac{x}{27.5}[/tex]

cross multiply to get: 24*27.5 = 15x

660/15 = x

x = 44

Answer:

Step-by-step explanation:

You want the equation of the line with slope 3/5 that passes through point (5, 3).

The point-slope form of the equation of a line with slope m through point (h, k) is ...

  y -k = m(x -h)

You have m=3/5, (h, k) = (5, 3), so your equation is ...

  y -3 = 3/5(x -5) . . . . point-slope form of desired equation

This can be simplified to ...

  y -3 = 3/5x -3

  y = 3/5x . . . . . . . add 3

Student 1 expression is correct 1/4(10 x+8) = -(1/2 x +13)+3(x +5)

Algebra is defined as a generalization of arithmetic in which numbers are represented by letters that are combined according to arithmetic rules. Elementary algebra, advanced algebra, abstract algebra, linear algebra, and commutative algebra are some of the sub-branches.

Given that 1/4(10 x+8) and -(1/2 x +13)+3(x +5)

Student 1: 1/4(10 x+8) = -(1/2 x +13)+3(x +5)

Student 2: 1/4(10 x+8) > -(1/2 x +13)+3(x +5)

Student 3: 1/4(10 x+8) < -(1/2 x +13)+3(x +5)

We have to find which student is correct for all values of x

Let us take x =1

Now substitute the x vale in student 1 expression

1/4(10 x+8) = -(1/2 x +13)+3(x +5)

1/4(10 (1)+8) = -(1/2 (1)+13)+3(1 +5)

1/4(18) = (-1/2 -13)+3(6)

18/4 = -1/2 -13 + 18

9/2 = -1/2 + 5

9/2 = (-1+10)/2

9/2 =9/2

So Student 1 expression satisfies

If student 1 expression is correct two are wrong

Therefore Student 1 expression is correct

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The sequence converges and its limit is zero

A sequence is an ordered set of numbers governed by a rule.

The limit of a sequence is the value the sequence approaches

The convergence of a sequence is when the sequence approached a definite value

The divergence of a sequence is when the sequence does not approach a  definite value.

Since we have the sequence (√3 - √1), (√4 - √2), (√5 - √3), (√6 - √2), We need to find the general term of the sequence.

Observing this, we find that the general term Uₙ = √(n + 2) - √n

To determine if the limit converges or diverges, we take the limit of the sequence as n → ∞.

So,

[tex]\lim_{n \to \infty} U_n = \lim_{n \to \infty} \sqrt{n + 2} - \sqrt{n} \\= \lim_{n \to \infty} \sqrt{n + 2} - \lim_{n \to \infty} \sqrt{n} \\= \sqrt{\infty - 2} - \sqrt{\infty} \\= \sqrt{\infty} - \sqrt{\infty} \\= \infty -\infty[/tex]

Since this is an indeterminate form, we use L'hopital's rule to find the limit.

Uₙ = √(n + 2) - √n

= √n{√[(n + 2)/n] - 1}

= √n÷ 1/{√[(1 + 2/n] - 1}

Differentiating, we have

lim n → ∞ Uₙ = lim n → ∞ d√n/dn ÷ d(1/{√[(1 + 2/n] - 1})/dn

= 1/(2√n)/-√[(1 + 2/n] - 1})⁻² × 1/2√(1 + 2/n] × (-2/n²)

= n²[√(1 + 2/n] - 1})²/(2√n)√(1 + 2/n]

= n²[√(1 + 2/n] - 1})²/(2√n)√(1 + 2/n)]

Dividing through by n², we have

= n²[√(1 + 2/n] - 1})²/n² ÷ (2√n)√(1 + 2/n)]/n²

= [√(1 + 2/n] - 1})² ÷ (2(√n)³√(1 + 2/n³)]

Dividing both the numerator and denominator by (√n)³, we have

= [√(1 + 2/n] - 1})²/(√n)³ ÷ (2(√n)³√(1 + 2/n³)]/(√n)³

= (1 + 2/n] - √(1 + 2/n] + 1)/(√n)³ ÷ [2√(1 + 2/n³)]

= (1(√n)³ + 2/n²] - √{(1 + 2/n]/n)³} + 1/(√n)³) ÷ [2√(1 + 2/n³)]

= (1(√n)³ + 2/n²] - √{(1/n³ + 2/n⁴} + 1/√n)³) ÷ [2√(1 + 2/n³)]

So, lim n → ∞ Uₙ = lim n → ∞  (1(√n)³ + 2/n²] - √{(1/n³ + 2/n⁴} + 1/√n)³) ÷ [2√(1 + 2/n³)]

=  (1(√∞)³ + 2/∞²] - √{(1/∞³ + 2/∞⁴} + 1/√∞)³) ÷ [2√(1 + 2/∞³)]

=  (0 + 0] - √{(0 + 0} + 0) ÷ [2√(1 + 0)]

= (0 - 0 + 0)/2

= 0/2

= 0

The sequence converges and its limit is zero

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Answer:

Step-by-step explanation:

Total number of candidates is:

Probability of a girl to be chosen as prefect:

Answer:

Probability = 15/23

Step-by-step explanation:

Now we have to,

→ find probability that prefect is a girl.

The total members are,

→ 15 girls + 8 boys

→ s = 15 + 8

→ [ s = 23 ]

Then the probability will be,

→ P = 15/s

→ [ P = 15/23 ]

Hence, the answer is 15/23.

The image of the polygon after rotation of 90° about the origin is  A'(-1, 3) , B'(2 , -2) , C'(-3 , -3) , the graph of the polygon and its image is shown below .

In the question ,

it is given that ,

the vertices of the polygon is A(-3,-1), B(2, 2), C(3,-3) .

the graph of the polygon ABC is shown below .

We know when the point (x , y) is rotated 90° in clockwise direction , it s coordinate change to (y , -x) .

So , image of coordinate A(-3,-1) is

A'(-1,-(-3)) = A'(-1, 3)

image of coordinate B(2, 2) is

B'(2 , -2)

image of coordinate C(3,-3) is

C'(-3 , -3)

So , the graph of the image with coordinates A'(-1, 3) , B'(2 , -2) , C'(-3 , -3) is shown below .

Therefore , The image of the polygon after rotation of 90° about the origin is  A'(-1, 3) , B'(2 , -2) , C'(-3 , -3) , the graph of the polygon and its image is shown below .

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Answer: based on the information that you gave me, I think the answer is :

A. sex is an explanatory variable; starting salary is the response variable ;area of specialization is a possible confounding variable

hope this helps

Step-by-step explanation:

The angles of the triangle will be 50°, 70°, 60° .

let the 3 angles of a triangle be A, B and C

The first acute angle A is given by = x + 20

The second acute angle B is given by = 2x + 10

The third acute angle C is given by = 4x - 60

Now we know that the sum of the angles of a triangle is 180°

So ,

A + B + C + = 180°

x + 20 + 2x + 10 +  4x - 60 = 180°

7x - 30 = 180°

7x = 210°

x = 30°

So, from the value of x , we can calculate the value of each angle

Therefore, the required angles are :

angle A = (x + 20)° = 30° + 20° = 50°

angle B = (2x + 10)° = 60° + 10° = 70°

angle C = (4x - 60)° = 120° - 60° = 60°

verification : sum of the angles = 50°  + 70° + 60°  = 180°

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The  GCF of 140 and 180 in the question can be expressed as 20.

The concept that will be used in the calculation is the concept of the Prime factorization.

Prime factorization  can be described as the way that can be used to find the prime factors of a number , making sure that the  original number is evenly divisible by these factors.

Prime factorization of 140 and 180 are:

40: (2 × 2 × 5 × 7)

180: (2 × 2 × 3 × 3 × 5)

Then the  common prime factors which are common  that can be associated with 140 and 180 which is the GCF of 140 and 180 is ( 2 × 2 × 5 )= 20.

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Let's solve your system by substitution.

4x−4y=8 and 5x−3y=18

Step: Solve 4x−4y=8 for x:

4x − 4y = 8

4x − 4y + 4y = 8 + 4y (Add 4y to both sides)

4x = 4y + 8

[tex]\frac{4x}{4} = \frac{4y + 8}{4}[/tex]

x = y + 2

Step: Substitute y + 2 for x in 5x − 3y = 18:

5x − 3y = 18

5(y+2) − 3y = 18

2y + 10 = 18  (Simplify both sides of the equation)

2y + 10 + (−10) = 18 + (−10)  (Add -10 to both sides)

2y = 8

y = 4

Step: Substitute 4 for y in x = y + 2:

x = y + 2

x=4+2

x=6  (Simplify both sides of the equation)

Answer:

x = 6 and y =4

Answer:

it is basic and .........

The number of solutions in the system is 1

From the question, the system of equations is given as

Also, we understand that the linear equation is a vertical straight line.

So, we have the system to be

A vertical line can only intersect with a quadratic line at one point

Hence, there is only one solution in the system

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a. Constant of proportionality is equal to 5.

b. Point (12, 60) represents that 12 pounds of sugar required to make 60 cups of coffee.

The graph is simply a structured representation of the data. It aids in our comprehension of the data. The numerical information gathered through observation is referred to as data.

In a line graph, the information or data is represented as a series of markers, or dots, and is then connected to one another by a straight line.

Usually, data that varies over time is represented with a line graph.

Given:

We have the relation between total number of cups of coffee and the total amount of sugar:

Let y represents the number of cups of coffee

and, x represents the amount of sugar

y ∝ x

y = kx

a. 'k' is the constant of proportionality

When  y = 20 , x = 4

20 = k × 4

k = 20/ 4

k = 5

b. From the graph point (12, 60) represents 12 is on the x-axis and y is on the y-axis.

12 represents amount of sugar and 60 represents the number of cups of coffee.

Hence, the Constant of proportionality is equal to 5.

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