Inversely proportional means there is a constant k such that:

m = k/(p - 1)^2

When p = 4 and m = 5, we have:

5 = k/(4 - 1)^2

5 = k/3^2

5 = k/9

__Cross multiply:__

k = 45

__The problems asks for m when p = 6. And we also now know that k = 45. So plug in the numbers:__

m = k/(p - 1)^2

m = 45/(6 - 1)^2

m = 45/5^2

m = 45/25

m =

**1.8**