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?
?
?
B:
?
?
C: From 1.03 hours to 5.94 hours after the injection
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Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point.
A. 
local maximum; 
saddle point; 
saddle point; 
local minimum; 
local minimum
B. 
local maximum; 
local minimum
C. 
local maximum; 
local minimum; 
local minimum; 
local minimum; 
local minimum
D. 
local maximum; 
saddle point; 
saddle point; 
saddle point; 
local minimum; 
local minimum; 
saddle point; 
local minimum; 
local minimum
Determine whether the ordered pair is a solution of the given equation.(-4, 4)y = x + 8
A. No B. Yes
Solve the system of equations algebraically for real values of x and y.
?
?
A. (8, 9), (9, 8) B. (3, 9), (9, 3) C. (9, 8), (9, 8) D. (8, 9), (8, 3) E. no solution
Solve the equation for the specified variable.Solve for b. A = 
h(B + b)
A. b = 
B. b = 2A - Bh
C. b = 
D. b = 