Which expression is equal to 72

 The last one is equal to 72

Step-by-step explanation:

2^3*3^2

2*2*2*3*3=72

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb