What will be an ideal response?
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The concentration C, in milligrams per deciliter, of a drug in the bloodstream t hours after an injection is given by
.
?
A: Make a graph of C versus t over the first 10 hours since the injection.B: The drug is effective as long as the concentration is 50 milligrams per deciliter or higher. Add to your graph the horizontal line 
.C: During what time period is the drug effective? Round your answer to two decimal places.
What will be an ideal response?
Graph. Be sure to label the vertex.x = y2 + 3y + 2
A. 
B. 
C. 
D. 
Find the exact value by using a half-angle identity.cos 
A. 
B. 
C. 
D. 
Solve the problem.The decay of 514 mg of an isotope is given by A(t) = 514e-0.021t, where t is time in years. Find the amount left after 63 years.
A. 137 mg B. 69 mg C. 503 mg D. 134 mg