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 2 m down from the top of the dome the ceiling is 28 m wide, find the best location for the light source.
A. 98 m down from the top
B. 73.5 m down from the top
C. 49 m down from the top
D. 24.5 m down from the top
Answer: D
Mathematics
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Find the mean for the list of numbers.Monthly checking account fees: $16, $10, $7, $11, $4, $2, $6Round answer to the nearest whole number if necessary.
A. $8 B. $11 C. $7 D. $6
Mathematics
Evaluate.
A. 1406 B. 1,771,560 C. 501,942 D. 50,616
Mathematics
Find the expected value.A fair coin is tossed three times, and a player wins $3 if 3 tails occur, wins $2 if 2 tails occur and loses $3 if no tails occur. If one tail occurs, no one wins. What is the expected value of the games?
A. $0.75 B. $2.00 C. -$3.00 D. $3.00
Mathematics
Solve by the substitution method.x - 5y = 78x - 4y = 56
A. {(x, y)|x - 5y = 7} B. {(-7, -1)} C. {(7, 0)} D. ?
Mathematics