Find the focus and directrix of the parabola.x2 = -16y
A. (0, -4); x = 4
B. (0, -4); y = 4
C. (-4, 0); y = 4
D. (0, -4); y = -4
Answer: B
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Solve the problem.A person is watching a boat from the top of a lighthouse. The boat is approaching the lighthouse directly. When first noticed, the angle of depression to the boat is 13° 12'. When the boat stops, the angle of depression is 49° 49'. The lighthouse is 200 feet tall. How far did the boat travel from when it was first noticed until it stopped? Round to the nearest foot.
A. 668 ft B. 706 ft C. 729 ft D. 684 ft
Solve the problem.Bill kept track of the number of hours he spent exercising each week. The results for four months are shown below. Find the mean number of hours Bill spent exercising per week. Round to the nearest hundredth.6.60 8.70 6.60 6.90 6.60 6.608.70 6.60 6.60 6.60 6.90 7.507.40 8.70 8.70 8.30 6.60 8.70
A. 7.41 B. 7.02 C. 7.84 D. 7.62
Solve the problem. Round to the nearest cent.Central Airlines offers a series discount of 35/35/5 for frequent flyers. If a round-trip airline ticket is $737, what is the net cost after the series discount?
A. $552.75 B. $184.25 C. $441.19 D. $295.81
Simplify the expression. Write your answer without negative exponents. Whenever an exponent is negative or zero, assume that the base is not zero.(-9x4y)(-2x2y6)
A. 18x6y7 B. -11x6y6 C. -18x6y6 D. 18x8y6