. Ifr varies inversely as the cube of s,
and r= 17 when s= 3, find r when s=2.

25.5

Step-by-step explanation:

r varies inversely as s i.e

r & 1/s

r = K/s

K = rs

r = 17, s = 3

K = rs = 17 x 3 = 51

Now we can obtain r when s = 2 as illustrated below:

r = K/s = 51/2

r = 25.5

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answer: d.) the total number of protons and neutrons is 15

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