Solve.The function h(t) = -16t2 + 128t - 240 gives the height h, in feet, of a flare fired from the bottom of a gorge 240 feet deep with an initial velocity of 128 ft/sec. The flare fired is visible only when it is above the rim (h = 0). During what interval can the flare be seen?
A. (6, 8)
B. (0, 3)
C. (3, 5)
D. (9, 11)
Answer: C
Mathematics
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Solve the problem.If an elevator starts on basement level B1 and goes down to B3, how far down has it gone?
A. It has gone up 2 levels. B. None of these C. It has gone down 2 levels. D. It has gone down 4 levels.
Mathematics
Multiply.7(6b)
A. 32b B. 42b C. 420b D. 35b
Mathematics
Decide whether or not the Law of Sines can be used to solve the triangle. Do not solve the triangle.
A. Yes B. No
Mathematics
Solve.In 1970, the population of a particular city is 785,000. In 1980, the population of the city is 689,300. Assume the population is decreasing according to the exponential-decay model. When will the population of the city be 100,000?
A. 2139 B. 2134 C. 2124 D. 2129
Mathematics