Class A has 11 pupils and class B has 20 pupils.
Both classes sit the same maths test.
The mean score for class A is 74.
The mean score for class B is 32.
What is the mean score (rounded to 1 DP) in the maths test across both classes?

Answers

Answer 1

Answer:

11(74)+20(32)=1454

1454÷31=46.9


Related Questions

how do I write two trillion ninety nine in number form?

Answers

Answer:

here

Step-by-step explanation:

2.000.000.099

WILL give 5 star thanks and brainliest

Answers

Answer:

There are 20 students in the class

Step-by-step explanation:

Answer:

I believe it is 20

Step-by-step explanation:

Tell me if  I am wrong so I can improve.

Select all the correct answers.

Which expressions are equivalent to √-27?

Answers

Answer:

the first one and that's the only one

2 Answers: Choice A and choice D

[tex]3i\sqrt{3} \ \text{ and } \ i\sqrt{27}[/tex]

===================================================

Work Shown:

We will use the rule that sqrt(A*B) = sqrt(A)*sqrt(B) to get the following

[tex]x = \sqrt{-27}\\\\x = \sqrt{-1*27}\\\\x = \sqrt{-1}*\sqrt{27}\\\\x = i\sqrt{27} \ \text{ ... one answer; choice D}\\\\x = i\sqrt{9*3}\\\\x = i\sqrt{9}*\sqrt{3}\\\\x = i*3*\sqrt{3}\\\\x = 3i\sqrt{3} \ \text{ ... another answer; choice A}\\\\[/tex]

While choices C and D seem to look equivalent, note how the 'i' is under the square root in choice C. The 'i' term must be outside the root to be equivalent to the original expression. We denote [tex]i=\sqrt{-1}[/tex]

What is the result of 8(x - y)? The value for x is -5 and y is -2

Answers

Answer:

8(-5 - -2) = 24. Inside the parantheses is 3. Then you'd multiply 8, which is 24

Step-by-step explanation:

Answer:

-24

Step-by-step explanation:

I got my answer by plugging in the value of the variables into the equation:

8(x - y)

8((-5) - (-2))

8(-3)

-24

I hope this helps! :)

No rush I just need help

Answers

Answer:

Answer will be A 200( 12+3)

What is the difference?: 7/8 − 1/3

Answers

Answer: 13/24

Step-by-step explanation: M A T H W A Y Calculator

Answer:

0.54166666666 or 13/24

Step-by-step explanation:

round 80,531 to nearest thousand

Answers

Answer:

81,000

Step-by-step explanation:

5 or grrater raise the score. since we are looking for thousands you will use the five in the hundred spot

Answer:

The answer is 81,000 Because it's not higher than 81,555

55 - 3x7 + 8 divided by 4=?

Answers

Answer:56 :)

Step-by-step explanation:

Answer:

36

Step-by-step explanation:

Question 23 (4 points)
Find the measure of ZA in trapezoid ABCD
А.40°
B.50°
C.130 °
D.140 °

Answers

Answer:

140°

Step-by-step explanation:

angle D+ angle A=180°(by co interior angle)

40°+a=180°

a=180°-40°

a=140°

What is h(x) = 7+ 10x + x2 written in vertex form?
Oh(x) = (x - 25)2 - 18
Oh(x) = (x - 5)2 + 32
h(x) = (x + 5)2 - 18
h(x) = (x + 25)2 + 32 free cookie for whoever answers

Answers

Answer:

h(x) = [tex](x+5)^{2}[/tex] -18

Step-by-step explanation:

-b/2a is the formula to find the vertex's x coordinate.

-10/2(1) = -5 and "(x+5)" represents a translation to the left 5 units, so that must be the answer

Which relationship describes angles 1 and 2?
1. Vertical Angles
2. Complementary Angles
3. Supplementary Angles
4. Adjacent Angles


Answers

Answer:

2 and then 1

Step-by-step explanation: 1 is the slideing line that goes up to down and 2 is the angle that goes left & right (thats all i can exsplain sorry ;(      )

what percent of one us dollar is $.25

Answers

Answer:

25%

Step-by-step explanation:

25/100 = 25%

The percentage value of $0.25 in one dollar is 25%.

Given data:
The initial amount is represented as $0.25.

The value of one dollar is $1.

To determine what percent $.25 is of one US dollar, divide $.25 by $1 and then multiply by 100 to express it as a percentage.

($.25 / $1) * 100 = 0.25 * 100

0.25 * 100 = 25 %

So, the value is 25 %.

Hence, $.25 is 25% of one US dollar.

To learn more about percentage, refer:

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i dont understand this

Answers

Answer:

'less than or equal to' sign

cassie is training for a marathon. she has been recording her miles in a journal leading up to race day. the following table shows some of her results. on sunday, cassie didn't run any miles. what could be a possible cause for this outlier

Answers

Answer:

There is an outlier because she was injured and could not run.

Step-by-step explanation:

There are several reasons why Cassie wouldn't have been able to run on Sunday, but a potential reason is because she had a minor injury that took her one day to heal. Because of her taking this day off, it creates an outlier in our table.

It’s A joke lol i jn ex hbd

A student says that the function shown by the table below can be represented by the rule y=x2-1. Describe and correct the error

Answers

Answer:

csd zxsd

Step-by-step explanation:

Frank is going to throw a ball from the top floor of his middle school. The function
h(t) = – 16t? +960 + 112 models the height, h, of the ball above the ground as a function of time t.
Find the time(s) when the ball's height is 112 feet.
The ball has a height of 112 feet when t =
one answer, express your answers separated by commas)
seconds. (If there is more than
The ball hits the ground at t =
seconds.
Add Work
Check Answer

Answers

Answer:

16t=69

Step-by-step explanation:

Number of cups of sugar that would be used with 2 cups of flour is ____.

Answers

1 cup of sugar is the answer
The answers is 1 cup of sugar would be used with 2 cups of flour

If you got paid $300.00 for working 40 hours, how much did you get paid per hour?

Answers

Answer:

7.50 dollar

Step-by-step explanation:

Answer:

$7.50

Step-by-step explanation:

300 divided by 40 is 7.50

help me answer this question please​

Answers

9514 1404 393

Answer:

  7953.873

Step-by-step explanation:

The first derivative is ...

  f'(x) = 4·3x²·e^x +4x³·e^x = e^x(4x³ +12x²)

Then the second derivative is ...

  f''(x) = (12x² +24x)e^x +(4x³ +12x²)e^x

  f''(x) = e^x(4x³ +24x² +24x)

So, f''(3) = (e^3)(4·27 +24·9 +24·3) = 396e^3 = 7953.87262158

Rounded to thousandths, this is ...

  f''(3) = 7953.873

Answer:

f''(x) ≈ 7953.87

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

BracketsParenthesisExponentsMultiplicationDivisionAdditionSubtractionLeft to Right

Algebra I

Factoring

Calculus

Derivatives

Basic Power Rule:

f(x) = cxⁿf’(x) = c·nxⁿ⁻¹

Product Rule: [tex]\displaystyle \frac{d}{dx} [f(x)g(x)]=f'(x)g(x) + g'(x)f(x)[/tex]

Derivative Rule: [tex]\displaystyle \frac{d}{dx} [e^x]=e^x[/tex]

Step-by-step explanation:

Step 1: Define

f(x) = 4x³eˣ

f''(x) is x = 3 for 2nd Derivative

Step 2: Differentiate

[1st Derivative] Product Rule [Basic Power Rule]:                                       f'(x) = 3 · 4x³⁻¹eˣ + 4x³eˣ[1st Derivative] Simplify:                                                                                 f'(x) = 12x²eˣ + 4x³eˣ[1st Derivative] Factor:                                                                                   f'(x) = eˣ(12x² + 4x³)[2nd Derivative] Product Rule [Basic Power Rule]:                                     f''(x) = eˣ(12x² + 4x³) + eˣ(2 · 12x²⁻¹ + 3 · 4x³⁻¹)[2nd Derivative] Simplify:                                                                             f''(x) = eˣ(12x² + 4x³) + eˣ(24x + 12x²)[2nd Derivative] Distribute eˣ:                                                                       f''(x) = 12eˣx² + 4eˣx³ + 24eˣx + 12eˣx²[2nd Derivative] Combine like terms:                                                           f''(x) = 24eˣx² + 4eˣx³ + 24eˣx[2nd Derivative] Factor:                                                                                 f''(x) = 4xeˣ(x² + 6x + 6)

Step 3: Evaluate

Substitute:                    f''(x) = 4(3)e³(3² + 6(3) + 6)Exponents:                   f''(x) = 12e³(9 + 6(3) + 6)Multiply:                        f''(x) = 12e³(9 + 18 + 6)Add:                              f''(x) = 12e³(27 + 6)Add:                              f''(x) = 12e³(33)Multiply:                        f''(x) = 396e³Evaluate:                       f''(x) ≈ 396(20.0855)Multiply:                        f''(x) ≈ 7953.87

Evaluate ab if a = -16 and b = -5.

Answers

9514 1404 393

Answer:

  80

Step-by-step explanation:

ab is the product of 'a' and 'b'. For the given values, that is the product ...

  ab = (-16)(-5) = 80

_____

When the number of minus signs is even, the resulting product is positive.

GIVING BRAINLIEST PLS HELP :(

Answers

Answer:

d) not proportional

Step-by-step explanation:

the rate of change between the first two pairs of x-and-y values is 12/3, between the second pair it is 21/3, and 15/3 between the last pair

4, 7, and 5 are all different values so there is not one constant of proportionality

Please help me I am having a panic attack please help

Answers

Answer:

340

Step-by-step explanation:

.34 multiplied by 1000. Move decimal to the right three spaces

340 millilitres

✨FrUiT DoNt ❌ HaVe EyEs So HoW mY aPpLE WaTcH ⌚️ ✨

Answers

Answer:

0_0

Step-by-step explanation:

Answer:

dont know

Step-by-step explanation:

A triangle has the vertices at A(1,3), B(4,2), and C(3,8). What transformation would produce an image with the vertices A’(3,-1),B’(2,-4), C’(8,-3)?

A) Reflection over the x axis

B) Reflection over the line y=x

C) Rotation 90° CW about the origin

D) Rotation 180° about the origin

Answers

9514 1404 393

Answer:

  C) Rotation 90° CW about the origin

Step-by-step explanation:

The transformation for rotation CW 90° is ...

  (x, y) ⇒ (y, -x)

This is apparently the transformation that gets ...

  A(1, 3) ⇒ A'(3, -1)

__

Additional comment

Attached is a list of the commonly used transformations for your reference.

Answer:

C

Step-by-step explanation:

I need help! Question is in attachment.

Answers

Answer:

andre worked with bigger numbers when dividing to do it faster but they were both the same

Step-by-step explanation:

Walmart has DVDs on sale at 4 for $38. What is the cost for 6 DVDs? Use words and/or numbers to justify your answer.

Answers

First find unit price
$38/4 = $9.50 per DVD
6 DVDs * total cost = answer
6 * 9.50 = 57
Solution: 6 DVDs cost $57

Jim is 9 years older than June. Alex is 8 years younger than June. If the total of
their ages is 82, how old is the eldest of them?

Answers

Answer:

36 years old (jim)

Step-by-step explanation:

looks like a good ol' word problem!

first, if you don't know what to do, always assign variables

Jim's age: x+9

June's age: x

Alex's age: x-8

we know the sum of their ages which is 82

so, x+9+x+x-8=82

simplify

3x+1=82

3x=81

x=27, but we're not done yet

Now we know x

jim: 36

june: 27

Alex: 21

so the oldest is jim at 36

3. Angles 1 and 2 are complementary. If mZ1=47°, find m2. *

Answers

a complimentary angle means the 2 angle
sums add to 90°. so the measurement of angle 2 would be 90-47. The answer is the measurement of angle 2 is 47°

19. Brian bought a new jacket at a discount of 30%. If the original price was $65, how much did Brian pay for the jacket?

Answers

Answer:45.5

Step-by-step explanation:

65•30%=19.5

65-19.5=45.5

Cost of the jacket with the discount is given by the equation A = $ 45.50

What is an Equation?

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the cost of the jacket with the discount be A

Now , the equation will be

The cost of the jacket = $ 65

The discount percentage =30 %

So , the discount amount = ( 30/100 ) x 65

The discount amount = 0.3 x 65

The discount amount = $ 19.50

Now , the cost of the jacket with the discount A = cost of the jacket - discount amount

Substituting the values in the equation , we get

The cost of the jacket with the discount A = 65 - 19.50

The cost of the jacket with the discount A = $ 45.50

Hence , the cost is $ 45.50

To learn more about equations click :

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A triangle has a base of 16" in height of 1/8 inch what is the area?

Answers

Answer:

Area of triangle is 1 inches²

Step-by-step explanation:

We are given:

Base of triangle = 16 inches

Height of triangle = [tex]\frac{1}{8} \:[/tex] inches

We need to find:

Area of triangle

The formula used to find Area of triangle is:

[tex]Area \:of\: triangle=\frac{1}{2}\times b \times h[/tex]

where b is base and h is height.

Putting values and finding area:

[tex]Area \:of\: triangle=\frac{1}{2}\times 16 \times \frac{1}{8}\\ Area \:of\: triangle=\frac{16}{16}\\ Area \:of\: triangle=1\:inches^2[/tex]

So,  Area of triangle is 1 inches²

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