8/13 = 0.6153
y = cos-1(0.6153)
y = 52.0
I'm not totally sure if this is what you mean or if this is.
y = cos(8/13) = 0.9999 which to the nearest tenth is 1.0
Answer:
B
Step-by-step explanation:
The height of 3 cut the base in half and perpendicular to the base, so

That is B
Answer:
728
Step-by-step explanation:
2+6+18+...+486
a=2
r=6/2=3
