Question

P varies inversely as the cube of q and p=8 when q=2.Find the value of q when p=216. *

Answer 1

Answer: 6

Step-by-step explanation:

Answer 2

Explanation:

Write the english as maths: y∝13√x

Change the variation to an equation by multiplying by a constant.

y=k3√x we need to find a value for k

k=3√x×y=3√8×12=2×12=24

Replace k with 24 to obtain the equation

y=243√x

Now we can calculate y for any given x.

y=243√1=241=24