Solve the problem.The percent of concentration of a certain drug in the bloodstream 
after the drug is administered is given by K(x) = 
. At what time is the concentration a maximum?
A. 6.4 hr
B. 4 hr
C. 3.2 hr
D. 8 hr
Answer: D
Mathematics
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Find the present value of the given annuity. Round to the nearest cent.Payments of $45,000 made semiannually for 12 years at 5% compounded semiannually
A. $800,253.00 B. $789,318.00 C. $398,848.50 D. $804,824.36
Mathematics
Factor the special products.y2 - u2
A. (y2 - u)(y2 + u) B. (y - u)(y + u) C. (y - u)(y - u) D. prime
Mathematics
Solve the problem.A room measures 
by 
The ceiling is 
above the floor. There is one window measuring 
by 
The door is 
-4.0px;" /> by 
What is the total area of the walls and ceiling (excluding the door and window)?
A. 1035.5 ft2
B. 665.5 ft2
C. 295.5 ft2
D. 699.5 ft2
Mathematics
Simplify the exponential expression.
A. x4
B. x2
C. x8
D. 
Mathematics