Solve.
A cylindrical grain silo with a hemispherical top is shown above. Find an expression for the volume of the silo and write the expression in factored form.
A. 
?r3 - 7?r2 = 2?r2
B. 
?r3 - 7?r2 = 7?r3
C. 
?r3 - 7?r2 = 7?r2
D. 
?r3 - 7?r2 = 7?r2
Answer: C
Mathematics
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 FIGURE.png)
Find cosB.
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