Solve the problem.The amount of tin A (in square inches) needed to make a tin can with radius r inches and volume 27 cubic inches can be found by the function 
Find the difference quotient when r = 2.6 in. and 
Use 3.14 for ?. Interpret the result.
A. At r = 2.6 in., A is decreasing at 25.6 in.2 per 1 in. increase in r.
B. At r = 2.6 in., A is increasing at 25.6 in.2 per 1 in. increase in r.
C. At r = 2.6 in., A is increasing at 256 in.2 per 1 in. increase in r.
D. At r = 2.6 in., A is decreasing at 256 in.2 per 1 in. increase in r.
Answer: B
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Identify the type of surface represented by the given equation.
+ 
= 
A. Ellipsoid B. Paraboloid C. Hyperbolic paraboloid D. Elliptical cone
Find the slope of the line through the points.(8, 3) and (8, -5)
A. 0
B. - 
C. Undefined
D. 
Find the perimeter.The city plans to frame the local playground with redwood lumber. How many feet of lumber will the city need?
A. 655 ft B. 768 ft C. 640 ft D. 16,384 ft
Solve the problem. It costs $350 to charter a bus for a ski trip. It also costs $400 per student for all other expenses including food, lodging, ski rental, and lift tickets. Let P(n) represent the per student cost (in dollars) to go on the trip if n students go on the ski trip. By finding an equation for P(n), determine how many students need to go on the trip so that the per person cost is no more than $420.
A. at most 18 students B. at least 17 students C. at most 17 students D. at least 18 students