M is a directly proportional to r cubed when r=4 M=160 1) work out the value of M when r=2
2) work out the value of r when M=540

1) When r = 2, M = 20.

2) When M  = 540, r = 6.

Step-by-step explanation:

M is a directly proportional to r cubed

This means that the equation for M has the following format:

In which a is a multiplier.

When r=4 M=160.

We use this to find a. So

So

1) work out the value of M when r=2

When r = 2, M = 20.

2) work out the value of r when M=540

When M  = 540, r = 6.

b. ol

step-by-step explanation:

i got the answer right on edg.

congruent: (geometry) (of figures) identical in form; coinciding exactly when superimposed.