Solve the problem.A projectile is thrown upward so that its distance above the ground after t sec is given by 
After how many seconds does it reach its maximum height?
A. 7 sec
B. 14 sec
C. 28 sec
D. 21 sec
Answer: B
Mathematics
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Round to the indicated place value.Round to the nearest whole number: 720.553
A. 720 B. 721 C. 720.6
Mathematics
Use trigonometric identities to solve each equation in the interval [0, 2?]4 sin2 x = 4 cos x + 1
A. 
B. 
C. ?
D. 
Mathematics
Perform the indicated operation. Write the sum as a fraction, whole number, or mixed number in lowest terms.16
+ 2
+ 
A. 20
B. 18
C. 19
D. 19
Mathematics
Solve the equation.10y = 3y + 6 + 6y
A. -60 B. 6 C. 60 D. -6
Mathematics