Respuesta :

mahalafries123

Answer:

if you go on khan academy its free it can explain better then me.

Step-by-step explanation:

1590404

Answer: the measure of angle A for the inside of the triangle is 180-12x+4.

Since the total angle measurement inside the triangle must be 180 degrees

180-12x+4+10x-10+30=180 is the equation we would use to find X so to solve that 174+30-2x=180, 204-2x=180, -2x=-24 x=12