Question

The table shows how the height of a stack of DVDs depends on the number of DVDs. What is a rule for the height?

Number of DVDs

Height (cm)
2
18
3
27
4
36
n
?

A. h = 9n

B. h = 8n

C. h = 2n

D. h = n/9

Answer 1

Answer: Option 'A' is correct.

Explanation:

Since we have given that

Number of DVDs Height

2 18

3 27

4 36

Since there is direct proportion between number of DVDs and height.

We need to find if the number of DVDs is n, then height would be

`(2)/(18)=(n)/(h)\\\\(1)/(9)=(n)/(h)\\\\h=9n`

Hence, the rule for the height for n is h = 9n.

Option 'A' is correct.

Answer 2

The right option is A.