Solve the problem.A projectile is thrown upward so that its distance above the ground after t seconds is 
After how many seconds does it reach its maximum height?
A. 6 s
B. 19.5 s
C. 13 s
D. 26 s
Answer: C
Mathematics
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Find the Cartesian coordinates of the given point.
A. 
B. 
C. 
D. 
Mathematics
Write an algebraic equation and use it to solve the problem.The length of a rectangular room is 8 feet longer than twice the width. If the room's perimeter is 196 feet, what are the room's dimensions?
A. Width = 35 ft; length = 78 ft B. Width = 60 ft; length = 136 ft C. Width = 45 ft; length = 53 ft D. Width = 30 ft; length = 68 ft
Mathematics
Find the product.(5x - 9y)2
A. 5x2 - 90xy + 81y2 B. 5x2 + 81y2 C. 25x2 - 90xy + 81y2 D. 25x2 + 81y2
Mathematics
Simplify the expression using the order of operations.(2 + 9) ? 7 + [16 ÷ (4 ÷ 4)]
A. 66 B. 81 C. 78 D. 93
Mathematics