Class A has 12 pupils and class B has 25 pupils.
Both classes sit the same maths test.
The mean score for class A is 80.
The mean score for both classes is 74.
What is the mean score (rounded to 2 DP) in the maths test for class B?

Answer: -2/5

1. Multiply out like using distributive property

3x+6 = 4-2x

2. Now just simplify

5x+6=4

5x=-2

x=-2/5

Answer:

Heyaa!!! Im Pinky! Im here to inform you that your answer is....

Step-by-step explanation:

1st. We need to Distribute:  

      3(+2)=2(2−)

      3+6=2(2−)

Just like That!

2nd. We have to Rearrange terms:

    3+6=2(2−)

   3+6=2(−+2)

3rd. Distribute One Last Time:

       3+6=2(−+2)

      3+6= −2+4

4th. Simplify:

    3=−2−2

5th. Add 2 to both sides of the equation:

      3=−2−2

      3+2=−2−2+2

6th. Simplify:

    5=−2  

7th. Divide both sides of the equation by the same term:

       5=−2

      5/5 = -2/5

8th. Solve:

  x = -2/5

        Have an Amazing day!!

~Pinky~

Answer:

I think it is 655.

Step-by-step explanation:

Answers Attached

__________________________________________________________

Step-by-step explanation:

by using the formula of circumference with diameter pie ×diameter

Answer:

2x+3

Step-by-step explanation:

Answer:

d=7.75

Have a good day:>

Answer:

median

Step-by-step explanation:

answer is the best measure of center for this dot plot is a median

answer options d

Answer:

X=41

Step-by-step explanation:

40x40 =1600

9x9=81

1600+81=1681

[tex] \sqrt{1681} [/tex]

=41

Answer:

yus can you answer this for me

Step-by-step explanation:

[tex]\red {incomplete \: question}[/tex]

Answer:

A

Step-by-step explanation:

Answer:

Step-by-step explanation:

to find the inverse first switch the x and y

y=log(x+3) inverse is x=log(y+3)

then change to exponential form to solve

[tex]log_{a} b=c[/tex] turns to[tex]a^{c}=b[/tex]

a is 10

b is y+3

c is x

[tex]10^{x} =y+3[/tex]  subtract 3 from both sides

[tex]10^{x} -3=y[/tex]

Answer:

10

Step-by-step explanation:

Answer:

48 crayons

Step-by-step explanation:

There are 6 boxes total, each with 8 crayons in them. Notice that if you would count all the crayons, you would add 8 to the total number of crayons each time you counted a box. There are 6 boxes, so that would be equivalent to adding 8 a total of six times. You would use multiplication: 6 x 8 which is 48.

Answer:

marley has 48 crayons he bought

step by step equation:

6 times 8 =48

you use multiplication to answer this question

Answer:

84

Step-by-step explanation:

Answer:

84

Step-by-step explanation:

16.8 would be multiplied by 5 since 0.2 is 1/5 of 1, therefore it would like

16.8 times 5 = 84

Answer: $6,945.75

6000(1+.05)^3

Answer:

2sinxcosx + sinx +1-2sin²x-1

2sinxcosx+sinx-2sin²x

sinx (2cosx+1-2sinx)

Answer:

Step-by-step explanation:

1) 2e^3

2) x = 9

3) ln (16f^2o^2)

4) No solution

Answer:

The tank will empty in 4 hours.

Step-by-step explanation:

Since a barrel contains 56 liters of kerosene, and it has two taps, one tap that draws 500 ml every 6 minutes and after first 5 liters are drawn from the barrel, the second tap also starts, and it draws 1 liter in every 5 minutes, to determine how many hours will be taken in all to empty the tank, the following calculation must be performed:

0.5 x X = 5

X = 5 / 0.5

X = 10

10 x 6 = 60

1 hour = 51 liters

1 hour 30 minutes = 51 - (1 x 6) - (0.5 x 5) = 42.5

2 hours = 42.5 - (1 x 6) - (0.5 x 5) = 34

2 hours 30 minutes = 34 - (1 x 6) - (0.5 x 5) = 25.5

3 hours = 25.5 - (1 x 6) - (0.5 x 5) = 17

3 hours 30 minutes = 17 - (1 x 6) - (0.5 x 5) = 8.5

4 hours = 8.5 - (1 x 6) - (0.5 x 5) = 0

Therefore, the tank will empty in 4 hours.

The total amount of rainfall is an illustration of the sum operator

The total amount of rainfall that fell on Tuesday is 35 mm

From the graph (see attachment), we have the following function values

f(10) = 2

f(11) = 3

f(12) = 2

f(1) = 4

f(2) = 6

f(3) = 8

f(4) = 10

f(5) = 0

Add up the function values to determine thet total amount of rainfall

Total = 2 + 3 +2 + 4 + 6 + 8 + 10 + 0

Evaluate the sum

Total = 35

Hence, the total amount of rainfall that fell on Tuesday is 35 mm

Read more about graphs at:

https://brainly.com/question/4025726

Answer:

Systematic Random Sampling

Step-by-step explanation:

Edge 2021

Answer:

Systematic Random Sampling

Step-by-step explanation:

Took the test.

Answer:

0.4032

Step-by-step explanation:

1. We assume, that the number 72 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 72 is 100%, so we can write it down as 72=100%.

4. We know, that x is 0.56% of the output value, so we can write it down as x=0.56%.

5. Now we have two simple equations:

1) 72=100%

2) x=0.56%

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

72/x=100%/0.56%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

Answer:

no

Step-by-step explanation:

your a  fattie

Answer:

Interest expressed as a percent of the principal will be referred to as an ... earned on an investment of P at the annual interest rate r for a period of t ... (c) monthly, (​d) weekly, (e) daily, and (f) continuously at a nominal annual ... and substitute x = 3−2y in for x in second equation and find 4y−3(3−2y) = 1.

Step-by-step explanation: sorry if that doesn't help :(

Answer:

2.5

Step-by-step explanation:

50 x $0.05 = 2.5