A. His answer is incorrect. 2 cubed is 2 X 2 X 2, which is 8. Add 4 and you have the answer of 12.
B. He may have multiplied 2 X 3 and then added 4, instead of multiplying 2 three times.
Cos D = adjacent of angle D/ Hypotenus
=33/65
Answer:
angle b = 25°
for angle A = 180 - 50 (ie 25 + 25)
angle a =130°
I graphed it out and it seems that both A and C are correct. I would check them to make sure.
