Solve the problem.Suppose that the radius r and volume V = 
?r3 of a sphere are differentiable functions of t. Write an equation that relates dV/dt to dr/dt.
A. 
= 4?r2
B. 
= 4?
C. 
= 
?r2
D. 
= 3r2
Answer: A
Mathematics
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Translate to a proportion and solve. Round to the nearest hundredth, if necessary.What number is 85% of 246?
A. 209.1 B. 20.91 C. 20,910 D. 2091
Mathematics
Write the expression in terms of sines and/or cosines, and then simplify.
A. sin x
B. 
C. 
D. 
Mathematics
Factor completely. If the polynomial is prime, state so.a3b3 + 64
A. (ab + 4)(a2b2 - 4ab + 16) B. (ab - 4)(a2b2 + 4ab + 16) C. (ab - 4)(a2b2 + 16) D. (ab + 4)(a2b2 - 16)
Mathematics
Use the product rule to simplify.
A. 7
B. 25
C. 5
D. 5
Mathematics