Solve the problem.A rock is propelled upward from the top of a building 270 feet tall at an initial velocity of 168 feet per second. The function that describes the height of the rocket in terms of time t is 
Determine the time at which the rock reaches its maximum height.
A. 4.2 sec
B. 10.5 sec
C. 8.4 sec
D. 5.25 sec
Answer: D
Mathematics
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Change the following number from scientific notation to decimal notation. 2.13 × 10-2
A. 0.0213 B. 213 C. 21.3 D. 2.13 E. 0.213
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Solve the problem by integration.Find the area bounded by 
y = 0, x = 2, and x = 4. Round to the nearest hundredth.
A. 0.52 B. 6.25 C. 5.1 D. 0.43
Mathematics
Solve the rational inequality.
> 
A. (6, ?) B. (-?, 6) C. (-?, ?) D. ?
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Graph the equation by finding the slope and y-intercept.4x + y = 7
A. 
B. 
C. 
D. 
Mathematics