Solve the problem.A domed ceiling is a parabolic surface. For the best lighting on the floor, a light source is to be placed at the focus of the surface. If 8 m down from the top of the dome the ceiling is 4 m wide, find the best location for the light source.
A. 0.3 m down from the top
B. 0.5 m down from the top
C. 0.1 m down from the top
D. 0.2 m down from the top
Answer: C
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Solve the problem.On the April 25 billing date, Malcolm had a balance due of $1516.06 on his credit card. The transactions during the following month were: 
The interest rate on the card is 1.4% per month. Using the average daily balance method, find the balance due on May 25 (April has 30 days).
A. $2205.25 B. $1542.91 C. $2204.54 D. $2198.91
Perform the indicated operation
The graph of a function f on the interval [0, 8] is shown in the figure. Compute the Riemann sum for f on [0, 8] using four subintervals of equal length and choosing the evaluation points to be (a) the left endpoints, (b) the right endpoints, and (c) the midpoints of the subintervals.
Solve the problem.A cross-section of an irrigation canal is a parabola. If the surface of the water is 41 feet wide and the canal is 1 feet deep at the center, how deep is it 5 feet from the edge?
A. 0.6 ft B. 0.2 ft C. 0.8 ft D. 0.4 ft