Solve the problem.Julie and Eric row their boat (at a constant speed) 21 miles downstream for 3 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 7 hours. Find the rate of the current.
A. 5 mph
B. 2 mph
C. 1.5 mph
D. 3 mph
Answer: B
Mathematics
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Calculate the surface area of the given surface.The surface f(x,y) = x2 + y2, -1 ? x, y ? 2. (Hint: Do the first integral by substitution or using a formula from the Table of Integrals. Use numerical integration to do the outer integral.)
A. 35.5222 B. 18.4734 C. 25.3332 D. 29.3516
Mathematics
Completely factor the polynomial or state that the polynomial is prime.x3 + 18x2 + 81x
A. prime B. x(x + 9)(x - 9) C. x(x + 9)2 D. x(x - 9)2
Mathematics
Express the statement as an equation involving the indicated variables.The surface area S of a sphere is 4 times ? times the square of the radius r.
A. S = 4?r2
B. S = 4? 
C. S = 4?r
D. S = ?r2
Mathematics
Use a graphing calculator to find the graph of the equation.y = x3 - 3x + 2
A. 
B. 
C. 
D. 
Mathematics