Convert the given equation to a rectangular equation.r = 
A. 15x2 + 16y2 - 64 = 0
B. 16x2 + 16y2 - 16x - 64 = 0
C. 15x2 + 16y2 - 16x - 64 = 0
D. 16x2 + 15y2 - 16y - 64 = 0
Answer: C
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Multiply.-0.6(-0.8)
A. 0.48 B. -1.3 C. -0.2 D. -1.4
A random variable has probability density function f(x) = 30x2(1 - x)2(0 ? x ? 1). Compute its cumulative distribution F(x).
A. 30x2 - 60x3 + 30x4 B. 10x3 - 15x4 + 6x5 C. 30x(1 - x) D. 10x3 - 15x4 + 6x5 + 1 E. none of these
A speedboat takes 3 hours longer to go 60 miles up a river than to return. If the boat cruises at 15 miles per hour in still water, what is the rate of the current?
A) 3 mi/h B) 4 mi/h C) 5 mi/h D) 6 mi/h
A right conical circular vessel is being filled with green industrial waste at a rate of 200 cubic meters per second. How fast is the level rising after 
cubic meters have been poured in? (The cone has height 75 m and radius 45 m at its brim. The volume of a cone of height h and cross-sectional radius r at its brim is given by 
style="vertical-align:middle;" />.) Round your answer to the one decimal place.
?
A. 
B. 
C. 
D. 
E. 