Answer:
40
Step-by-step explanation:
Plug x=-9 in. -9-8+(-9×(-8)) -15=-17+72-15=-17+72-15=40. I hope this helped!
Step-by-step explanation:
∠6 = 10x
∠7 = 5x
∠6 = ∠8
∠7 = ∠5
Find value of x
∠5 + ∠6 + ∠7 + ∠8 = 360
5x + 10x + 5x + 10x = 360
30x = 360
x = 360/30
x = 12°