Answer:
-3x x(2x²+4x-3)
Step-by-step explanation:
8x40=320 (+) 8x7=56 (=) 376.
A=40
hope this helped
X=20° is your answer
X+3x+10°=90°
4x+10°=90°
4x=(90-10)°
X=80/4
X=20°