Solve the problem.A ball is thrown vertically upward at an initial speed of 
Its height (in feet) after t seconds is given by 
After how many seconds does the ball reach its maximum height?
A. 2.5 seconds
B. 1.25 seconds
C. 5 seconds
D. 1.67 seconds
Answer: B
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Find the simple interest. (The rate is an annual rate unless otherwise noted. Assume 360 days in a year.)p = $4479, r = 0.05% per day, t = 6 months
A. $470.30 B. $0.45 C. $335.93 D. $403.11
Simplify the expression.- 
+ 
A. 
B. 
C. 
D. - 
A tank initially contains 60 gal of brine, in which 10 lb of salt is dissolved. Brine containing 2 lb of dissolved salt per gallon flows into the tank at the rate of 4 gal/min, and the well-stirred mixture flows out of the tank at the same rate. How much salt is present in the tank at the end of 10 min? ? Round the answer to the nearest tenth, if necessary. ? __________ lb
Fill in the blank(s) with the appropriate word(s).
Let x be a number. Translate the English phrase or sentence into a mathematical expression. 76 decreased by a number
A. 76 - x B. 76 ÷ x C. x - 76 D. 76 + x