The point-slope form:

We have two points (-9, 7) and (9, 1). Substitute:

You're basically using the supplement angle to find the missing number.
Answer:
65
Step-by-step explanation:
B.) would be correct
(x,y)
x=-5
y=x+4
y=(-5)+4
y=-1
(-5,-1)
30b³ + 20b² + 15b + 10 = ...(:5)
6b³ + 4b² + 3b + 2 =
6b³ + 3b + 4b² + 2 =
3b(2b²+1) + 2(2b²+1) =
(2b²+1)*(3b+2)