Solve the problem.The concentration c (in mg/L) of a certain drug in the bloodstream is found to be 
where t is time (in h) after the drug is taken. Find dc/dt.
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Solve the system of equations by substitution. x + 2y = 23x - 7y = -7
A. (1, 1) B. (0, 0) C. (1, 0) D. (0, 1)
Mathematics
Factor by grouping.xy + 11x - 2y - 22
A. (y + 11)(x - 2) B. (x - 11)(y + 2) C. (x + 11)(y - 2) D. (y - 11)(x + 2)
Mathematics
Factor out the GCF from the polynomial. If the GCF is 1, write prime.7x2 + 21x - 28
A. 7(x2 + 3x - 4) B. 7(x2 + 14x - 21) C. 7x(x + 3 - 4) D. 7(x2 + 21x - 28)
Mathematics
Use your calculator to evaluate the expression rounded to three decimal places. e6
A. 0.002 B. 0.778 C. 403.429 D. 1.792
Mathematics