Solve the problem.The formula D = 8e-0.6hcan be used to find the number of milligrams D of a certain drug that is in a patient's bloodstream h hours after the drug has been administered. The drug is to be administered again when the amount in the bloodstream reaches 4 milligrams. What is the time between injections?
Fill in the blank(s) with the appropriate word(s).
about 1.2 hours
Mathematics
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Factor.x2 + 2xy - 24y2
A. (x - 6y)(x + 4y) B. (x - y)(x + 4y) C. (x + 6y)(x - 4y) D. (x - 6y)(x + y)
Mathematics
Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. 
B. {(7, -4)}
C. {(9, 3)}
D. no solution; ?
Mathematics
Fill in the blank with one of the words or phrases listed below.
An angle whose measure is between 90° and 180° is called a(n)
angle.
A. right B. obtuse C. straight D. acute
Mathematics
Solve the equation
?
?
A. 
B. 
C. 
D. 
E. 
Mathematics