If f (x) = x + 4 and g (x) = x, what is (gºf) (-3) ?

(gºf) means solve f (x) first, then use that for g (x)

In the equation for f (x) replace x with - 3:

f (x) = x + 4 = - 3 + 4 = 1

Now replace the x in the equation for g (x) with 1

g (x) = x = 1