by A.Y.

(USA)

PEMDAS (follow the order)

(P)arentheses

(E)ponents

(M/D)Multiplication/Divison

(A/S)Addition/Sutraction

*For the M/D A/S which ever comes first in the problem you do first.

Well parentheses are first so:(5+2=7)

Next is exponents:2^2=4

Then multiplication: 5*4=20

Then you have your answer: 20+7+12-4=35