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?

Answer 1

The right option is A.

Answer 2

Answer: Option 'A' is correct.

Step-by-step 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

$\dfrac{2}{18}=\dfrac{n}{h}\\\\\dfrac{1}{9}=\dfrac{n}{h}\\\\h=9n$

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

Option 'A' is correct.