Simplify the expression. If any variables are present, assume that they are positive.
A. y2
B. y2
C. y
D. y2
Answer: C
Mathematics
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One of the values r (radius), d (diameter), C (circumference), or A (area) is given for a particular circle. Find the indicated value. Leave ? in your answer.C = 100? ft; d = ?
A. 200 ft B. 100 ft C. 200? ft D. 50 ft
Mathematics
Find the area enclosed by the given curves.Find the area of the region between the curve y = 4x/(1 + x2) and the interval 
of the x-axis.
A. ln 10 B. 4 e10 C. 0 D. 4 ln 10
Mathematics
Multiply.-8(-3)(4)
A. 96 B. 196 C. -96 D. 86
Mathematics
Solve the problem. Use 3.14 for ?.Find the cost to asphalt a circular racetrack if asphalt costs $30 per 100 ft2. (Round to the nearest dollar.) r = 100 ft R = 145 ft 
A. $19,806 B. $10,386 C. $9420 D. $7630
Mathematics