Solve the equation symbolically.
+ 
= 4
A. 0
B. 2, -2
C. 
, -2
D. -2
Answer: D
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Solve the problem.A cross-country skier reaches the 12-km mark of a race 40 min after reaching the 
mark. Find the average rate of change in the speed of the skier.
A. 9 km/hour
B. 
km/hour
C. 
km/hour
D. 18 km/hour
Graph.f(x) = 2?x? - 3
A. 
B. 
C. 
D. 
Use a graphing utility to graph the function over the indicated interval and approximate any local maxima and local minima. Determine where the function is increasing and where it is decreasing. If necessary, round answers to two decimal places.f(x) = -0.3x3 + 0.2x2 + 4x - 5; (-4, 5)
What will be an ideal response?
Express the unit vector as indicated.Express the unit vector u = (cos ?)i + (sin ?)j in the same direction as the vector -2i - 11j
A. - 
i - 
j
B. 
i + 
j
C. 
i + 
j
D. 
i - 
j