After getting 5 new rocks, george gave half of his rock collection to susan. if george gave susan 36 rocks, which equation could be used to determine how many rocks george started with? a) 1/2 x = 36+5 b) 1/2 (x-5) = 36 c) 1/2 (x+5) = 36 d) 1/2 x+5 = 36 give details !