Solve the problem.The concentration of a drug in the bloodstream, measured in milligrams per liter, can be modeled by the function, 
where t is the number of minutes after injection of the drug. When will the drug be at its highest concentration? Approximate your answer rounded to two decimal places.
A. t = 4 minutes after the injection is given
B. t = 3.65 minutes after the injection is given
C. at the time of injection
D. t = 0.55 minutes after the injection is given
Answer: D
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Solve the problem.The charges for renting a moving van are $65 for the first 40 miles and $7 for each additional mile. Assume that a fraction of a mile is rounded up. a. Determine the cost of driving the van 98 miles.b. Find a symbolic representation for a function f that computes the cost of driving the van x miles, where 
(Hint: express f as a piecewise-constant function.)
A. a. $471; b. f(x) =
B. a. $6776; b. f(x) =
C. a. $1031; b. f(x) =
D. a. $471; b. f(x) =
Find the sum of the arithmetic series using a formula.2 + 4 + 6 + ... + 1324
A. S662 = 438,906 B. S662 = 439,569 C. S662 = 437,582 D. S662 = 438,244
Provide an appropriate response.The cost of an item if the full amount had been paid at the time of sale is called the:
A. down payment price B. total price C. cash price D. installment price
Evaluate the square root.
A. 2 B. 0.002 C. 0.2 D. 0.02