Solve the problem.A projectile is thrown upward so that its distance above the ground after t seconds is h(t) = -15t2 + 420t. After how many seconds does it reach its maximum height?
A. 21 sec
B. 28 sec
C. 7 sec
D. 14 sec
Answer: D
Mathematics
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Graph the equation.x2 + (y - 3)2 = 9
A. 
B. 
C. 
D. 
Mathematics
Find A-1, if it exists.A = 
A. 
B. Does not exist
C. 
D. 
Mathematics
Solve the problem. Round your answer to the nearest cent.John Lee's savings account has a balance of $2576. After 9 years, what will the amount of interest be at 6% compounded semiannually?
A. $785.10 B. $1391.04 C. $1809.47 D. $1776.10
Mathematics
Write a fraction to represent the shaded area of the figure.
A. 
B. 
C. 
D. 
Mathematics