Question

R is directly proportional to the cube of M. When R is 2, M is 160. FInd the vlaue of M when R is 3

Answer 1

Answer:

183.15 to 2 d.p

Step-by-step explanation:

R=kM³

2=k(160)³

2=4096000k

2/4096000=k

3=2/4096000M³

3/(2/4096000)=M³

6144000=M³

M=183.15 to 2DP

(to double check substitute you answer back in: )

3=k(183.15)³

3/(183.15)³=2/4096000

There u have it :)