Express the given vector as a linear combination of the unit vectors i and j.s = 
A. 7i + 8j
B. 8i - 7j
C. -8i - 7j
D. -7i - 8j
Answer: D
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Sketch the surface z = f(x,y).f(x, y) = 1 - x - 2y
A. 
B. 
C. 
D. 
Write an equivalent double integral with the order of integration reversed.
A. 
B. 
C. 
D. 
Use the two-stage method to solve.Maximizez = 5x1 + 4x2subject to:x1 + 2x2 = 15 x1 + x2 ? 12 2x1 + x2 ? 30 x1 ? 0, x2 ? 0
A. Maximum is 63 for x1 = 11, x2 = 2 B. Maximum is 75 for x1 = 15, x2 = 0 C. Maximum is 60 for x1 = 0, x2 = 15 D. Maximum is 57 for x1 = 9, x2 = 3
Solve.April shoots an arrow upward into the air at a speed of 64 feet per second from a platform that is 14 feet high. The height of the arrow is given by the function h(t) = -16t2 + 64t + 14, where t is the time is seconds. What is the maximum height of the arrow?
A. 78 ft B. 64 ft C. 10 ft D. 14 ft