Simplify. if x = 4, evaluate -x a: -8 b: 4 c: 0 d: -4

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Will give brainliest immeadeately true or false: the origin woud be included in the solution set for the inequality: y< 2x-5

Can someone me with the property questions for 12 13 and 14 plz