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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For the pair of functions, find the product (fg)(x).f(x) = 5x + 4, g(x) = -x2 + 4x + 7
A. -5x3 + 16x2 + 51x + 28 B. 5x3 + 16x2 - 51x - 28 C. -5x3 - 17x2 + 51x - 28 D. -10x2 + 16x2 - 51x + 28
Mathematics
Find all real and imaginary solutions to the equation.
- 
+ 1 = 0
A. {12, 8}
B. 
C. {7, 3}
D. {2, -2}
Mathematics
Express as the logarithm of a single expression. Assume that variables represent positive numbers.log66 + log613
A. log678 B. log619 C. log1219 D. log1278
Mathematics
Find the exact value of the expression.sin 250° cos 10° - cos 250° sin 10°
A. - 
B. 
C. 
D. - 
Mathematics