Solve.The function h = -16t2 + 16t + 272 gives the height h, in feet, of a coin tossed upward from a balcony 
high with an initial velocity of 16 ft/sec. During what interval of time will the coin be at a height of at least 80 feet?
A. [0, 1]
B. [3, 4]
C. [4, 8]
D. [0, 4]
Answer: D
Mathematics
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Convert the mixed number into an improper fraction.17
A. 
B. 
C. 
D. 
Mathematics
Rewrite using exponential notation. Assume that even roots are of nonnegative quantities and that all denominators are nonzero.
3
A. (7x3y)3/5 B. (7x3y)5/3 C. (7xy)4 D. (7x3y)2
Mathematics
Forces F1 and F2 act at the same point. Find the resultant force F and its magnitude.F1 = 0.1i + 0.4j, F2 = -1.3i - 9.2j
A. F = 0.5i - 10.5j ; 
= 10.511898
B. F = -1.2i - 8.8j ; 
= 8.88144132
C. F = -1.2i + 9.6j ; 
= 9.6747093
D. F = -1.2i - 9.6j ; 
= 9.6747093
Mathematics
Find the indicated sum. If necessary, round to four decimal places.S5 for the geometric sequence 3, 0.3, 0.03, . . .
A. 3.3329 B. 29.9997 C. 1.1111 D. 3.3333
Mathematics