Find the derivative.y = 
A. x ex
B. 
C. 
D. 
Answer: C
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Solve the problem.A rectangular sheet of perimeter 39 cm and dimensions x cm by y cm is to be rolled into a cylinder as shown in part (a) of the figure. What values of x and y give the largest volume?
A. x = 15 cm; y = 
cm
B. x = 13 cm; y = 
cm
C. x = 12 cm; y = 
cm
D. x = 14 cm; y = 
cm
Evaluate the expression, given x = -2, y = 3, and a = -4.(8x - 3y)(-2a)
A. 240 B. 200 C. -200 D. 160
Evaluate the function at the specified value of the independent variable and simplify. g(s) = 3s + 1 g(-18)
A. g(-18) = -55 B. g(-18) = -54s + 3 C. g(-18) = -18s - 1 D. g(-18) = -18s + 1 E. g(-18) = -53
Solve.At a fixed temperature, the resistance R of a wire varies directly as the length l and inversely as the square of its diameter d. If the resistance is 1.05 ohm when the diameter is 1 mm and the length is 210 cm, what is the resistance when the diameter is 4 mm and the length is 2220 cm?
A. 145.688 ohm B. 2.775 ohm C. 138.75 ohm D. 0.694 ohm