Solve.A rocket is launched from the top of a cliff that is 112 feet high with an initial velocity of 280 feet per second. The formula y = -16x2 + 280x + 112models the rocket's height above the ground, y, in feet, x seconds after it was launched. After how many seconds will it strike the ground? Round to the nearest tenth of a second, if necessary.
A. 19.4 sec
B. 18.9 sec
C. 18.4 sec
D. 17.9 sec
Answer: D
Mathematics
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Solve the application problem.Jim can run 5 miles per hour on level ground on a still day. One windy day, he runs 13 miles with the wind, and in the same amount of time runs 6 miles against the wind. What is the rate of the wind? (Round your answer to the nearest tenth, if necessary.)
A. 3.5 mph B. 13.6 mph C. 5 mph D. 1.8 mph
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Perform the indicated operation. Write the result in the form a + bi.(-3 + 4i) - 5
A. 8 - 4i B. 2 + 4i C. 2 - 4i D. -8 + 4i
Mathematics
Use the product rule to multiply.
? 
A. 5
B. 2
C. 
D. 35
Mathematics
Provide an appropriate response.Find the value of the sin 325°.
Fill in the blank(s) with the appropriate word(s).
Mathematics