Answer:
D. 14 Degrees
Step-by-step explanation:
ummmmm please explain better
7) Right triangle
8) Acute
9) Right triangle
10) obtuse
c. (3x^2-1)(x-7)
=(3x^3-21x^2)+(-x+7)
=-(x-7)+3x^2(x-7)
=(3x^2-1)(x-7)