Solve.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? Round to the nearest second.
A. 33 sec
B. 14 sec
C. 11 sec
D. 44 sec
Answer: B
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Solve the problem.The "equilibrium constant" for a chemical reaction is often used to calculate the amounts of chemical substances that are present in a system. For a particular reaction, the equilibrium constant K is given by the formula 
where A, B, and C are the amounts (in arbitrary units) of chemicals a, b, and c. Calculate the equilibrium constant if A = 5, B = 4, and C = 6. Round your answer to three decimal places when necessary.
A. 21,600 B. 1.852 C. 0.463 D. 2.778
Write as a decimal. Round to the nearest thousandth, if necessary.
A. 0.552 B. 0.181 C. 1.813 D. 0.055
Find the slope of the line that goes through the given points.(9, 6), (2, 6)
A. 0
B. 
C. - 
D. Undefined
Find the product.(x - 7)(x + 5)
A. x2 - 2x - 35 B. 2x - 35 C. x2 + 2x + 35 D. 2x2 + 35