10x-13
Step-by-step explanation:
-3(6x+7)+4(7x+2)
-18x-21+28x+8
10x-21+8
the anwser is d) 75°
step-by-step explanation:
according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.