Answer:
DEF =77.4 inches I attached an answer sheet so you can know how to work out the problem
Answer:

Step-by-step explanation:
Move
to the denominator in 
using the negative exponent rule 
In this problem, you must use SohCahToa which basically means:
Sin - opposite over hypotenuse
Cosine - adjacent over hypotenuse
Tangent - Opposite over hypotenuse
So in this picture we have 4 -which is on the opposite side of x - and a 5 -which is the hypotenuse of the triangle. This means we must use sin.
Using a calculator you put in:

Your answer is 53.13 degrees
3•2•7=42•2=84
12•10•7=840
84+840=924in^3