What number plus one half is equal to three eights?

Liesl grew 7/12 of a foot in one year. her little sister grew 1/3 of a foot during that same year. how much more did liesl grow than her little sister did

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Find the smallest number by which the given number should be divided to make a perfect cube(with steps or the answer will get reported) a.108 b.2187