Solve the problem. Round your answer to the nearest tenth, when appropriate.A toy rocket is shot vertically upward from the ground. Its distance in feet from the ground in t seconds is given by 
. At what time or times will the ball be 
from the ground?
A. 1.8 and 8.1 sec
B. 153.4 and 162.6 sec
C. 4.9 sec
D. 9.9 sec
Answer: A
Mathematics
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Which of the following are words or concepts not associated with a coordinate plane?? ?
A. ?Cartesian Plane B. Cartesian Coordinate System? C. Rectangular Coordinate System D. ?Ordered Pairs E. ?Quadrants F. ?None of the above.
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Find the indicated derivative.Find y(4) if y = 6 sin x.
A. y(4) = - 6 sin x B. y(4) = - 6 cos x C. y(4) = 6 sin x D. y(4) = 6 cos x
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Find the exact value of the expression without using a calculator.cos 
cos 
+ sin 
sin 
A. 
B. 
C. 
D. - 1
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Does the system have one solution, no solution, or an infinite number of solutions?2x + 3y = 64x + 6y = 12
A. One B. No Solution C. Infinite number
Mathematics