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Annette [7]
3 years ago
9

the average height of a class of 18 students is 105cm. After the arrival of 7 new students the average decreases by 5cm. Find su

m of the heights of all the students in the class
Mathematics
1 answer:
Marizza181 [45]3 years ago
5 0

Step-by-step explanation:

18+7=105-5

25/25=100/25

4

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The perimeter of a square is 32 cm what is the length of a diagonal
Dafna1 [17]
First you should draw yourself a square.Since you know it is a square you can find each side by dividing it by 4. 32/4 = 8. Since it is a square you know that both the length and width are 8. If you draw in the diagonal that is a right triangle. Use the Pythagorean theorem a^2 + b^2= c^2  to find the length of the diagonal. 
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4 years ago
How to rewrite 2+2+2+2+2 into a multiplication problem?
inna [77]

Answer:

2 x 5

Step-by-step explanation:

Think of it as "the value 2 is being added together 5 times" being added together so it could be written as 2 times 5.

5 0
3 years ago
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Enter your answer and show all the steps that you use to solve this problem in the space provided.
dexar [7]

Answer:14!

Step-by-step explanation:22-8=...?

8 0
4 years ago
Which of the following reasons can be used to justify statement #4 in the proof?
Montano1993 [528]

Answer:

D.

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3 0
3 years ago
Please help me thank you
gayaneshka [121]

Answer:

x = 6

Step-by-step explanation:

First, separate the problem into -\frac{2x}{3} +9=\frac{4x}{3} - 3

Then, Subtract 9 from both sides of the equation. -\frac{2x}{3} +9-9=\frac{4}{3} * x - 3-9

Simplify. -\frac{2x}{3}=\frac{4x}{3}-12

Multiply 3 to each side, which will give you -2x = 4x - 36

Subtract 4x from each side  -2x - 4x = 4x - 36x - 4x

Combine like terms: -6x = -36

Divide both sides by -6

Your answer should be 6

<em>(sorry for the late answer)</em>

5 0
3 years ago
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