Answer:
x= -12.6/7. you may try this
10°
Step-by-step explanation:
the sum of interior angles of triangle is 180°
so. 8x+x+90°=180°
9x=90°
x=10°
-1425
Day 1 - 475
Day 2 -475
Day 3 - 475
-475+ -475 + -475 = -1425