Solve the problem.A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of 192 ft/sec, and the gorge is 560 ft deep, during what interval can the flare be seen? (h = -16t2 + vot + ho.)
A. 5 < t < 7
B. 10 < t < 12
C. 15 < t < 17
D. 0 < t < 5
Answer: A
Mathematics
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Perform the indicated operation.
A. -24 B. 24 C. -6 D. 6
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Multiply and simplify.
? 
A. 
B. 
C. 
D. 
Mathematics
Let v and w be two vectors in the plane with given magnitudes. The angle between v and w is ?. Find the expression. Round the answer to the nearest tenth.
= 5, 
= 9, ? = 51°
Find 
A. 10.3 B. -42.6 C. 7.0 D. 12.8
Mathematics
Use intervals to describe the real numbers satisfying the inequality, x < 9, x ? -2.
A. (-2, 9) B. (-2, 9] C. [-9, 2) D. [-2, 9) E. none of these
Mathematics