What is the equivalent expression to (8^-5/2^-2)^-4

Determine the quotient of the following expression. (15n^2-27n) / 3

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

Rob filled 5 fewer plastic boxes with football cards than basketball cards. he filled 11 boxes with basketball cards.