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M is directly proportional to r cubed. When r=4, M=160.
A) Work out the value of M when r=2.
B) Work out the value of r when M=540.

Respuesta :

Shakurr

Answer:

A. M= 20

B. r = 6

Step-by-step explanation:

M=kr³

where k is the constant

M= 160 , r 4

160= k(4)³

k = 160/4³= 2.5

A. when r= 2 , M= kr³

M= 2.5(2)³ = 20

B. when M= 540, find r

M= kr³

r³ = M/k

r³ = 540/2.5

r³= 216

r = 6

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