Question

Can someone please give me the answer i dont need to know how to work it out.

Answer 1

a. M = 20

b. r = 6

Step-by-step explanation:

M ∝ r³

M = kr³

• where k is the constant

Given r = 4 and M = 160.

160 = k(4)³

160 = 64k

k = 160/64 = 2.5

So equation: M = 2.5r³

a) M = 2.5r³ = 2.5(2)³ = 20

b) 540 = 2.5r³

r³ = 540/2.5 = 216

r = ∛216

r = 6