Solve the problem.If an object is propelled upward from a height of 80 feet at an initial velocity of 64 feet per second, then its height h after t seconds is given by the equation 
After how many seconds does the object hit the ground?
A. 4.0 sec
B. 5 sec
C. 2.5 sec
D. 11 sec
Answer: B
Mathematics
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Find the derivative of y with respect to x, t, or ?, as appropriate.y = ln 5x2
A. 
B. 
C. 
D. 
Mathematics
Write in terms of the cofunction of a complementary angle.tan 8°
A. cot 172° B. cot 98° C. cot 82° D. tan 82°
Mathematics
Reduce the fraction by finding a common factor in the numerator and in the denominator and dividing by the common factor.
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.In a school survey, students showed these preferences for instructional materials. 
About how many students would you expect to prefer written materials in a school of 1000 students?
A. About 90 students B. About 180 students C. About 9 students D. About 360 students
Mathematics