Competition!!!

// this is my competition!!! O.k you have to get all three questions right to get ur prize!!!!!!! Good luck!!!!!!! //** **//1. wat is 37 + 36 + 50 + 58 + 71 + 0 - 23 -54 x 100 x 2 x 5 x 8 + 1 - 2 + 3 = _//**
 * //Heyz//
 * //2. there are 3 mistakess in this sentance. - how many mistakes in that sentance? and what are they???//**