Solve the problem.Suppose that the radius r and the circumference C = 2?r of a circle are differentiable functions of t. Write an equation that relates dC/dt to dr/dt.
A. 
= 2?r
B. 
= 
C. 
= 2?
D. 
= 2?
Answer: C
Mathematics
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Select the best estimate of the specified quantity.The sum 743.55 + 138.2
A. 880 B. 900 C. 870 D. 890
Mathematics
Graph the polar equation.r = 5(1 -sin ?)
A. 
B. 
C. 
D. 
Mathematics
Round as indicated.13,711 to the nearest hundred
A. 13,800 B. 13,710 C. 13,700 D. 13,600
Mathematics
Identify whether the given scatterplot shows a positive association, negative association, or no association.The following scatterplot shows the heights (in inches) of a group of children and their ages. 
Age (years)What type of association is there for this data?
A. positive association B. no association C. negative association
Mathematics