What is the additive inverse of the expression below, where a and b are real numbers?
2a+b
0 -1
100
2a-6
o -2a-b

Choose all answers that apply: a) ab and a’b’ are one the same line. b) quadrilaterals abcd and a’ b’ c’ d’ have the same perimeters. c) points a and a’ have the same coordinates. d) none of the above

Given: ac and db are diameters. m∠3=

Find the solution of this system of equation -7x+y=-20 9x-3y=36