Find the formula for the function.Express the area of a circle as a function of its radius r.
A. A = 2?r
B. A = ?r3
C. A = ?r2
D. A = ?r
Answer: C
Mathematics
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Solve.In the equation y = cos x, where would you insert a nonzero constant if you wanted to change 
amplitude of the graph or 
period?
What will be an ideal response?
Mathematics
Solve the equation graphically, numerically, or symbolically. If appropriate, round the solution to hundredths. ?k? + 4 = 15
A. 19, -19 B. -11 C. 11 D. 11, -11
Mathematics
Use =, <, or > to write a true statement.-0.5 0.833
A. = B. > C. <
Mathematics
Fill in the blank with one of the words or phrases listed below.
Two numbers are 
of each other if their product is 1.
A. cross products B. reciprocals C. equivalent D. undefined
Mathematics