Solve the problem.The rate of change in the concentration of a drug with respect to time in a user's blood is given by
where D(t) is dosage at time t and k is the rate at which the drug leaves the bloodstream. If D(t) is a constant D, and 
solve the differential equation to find a formula for C(t), the concentration at time t.
A. C(t) = 
B. C(t) = 
C. C(t) = 
D. C(t) = 
Answer: C
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Complete the ordered pair for the given equation.y = -4x - 24(-8, )
A. (-8, -24) B. (-8, 3) C. (-8, 8) D. (-8, -8)
Solve.A windmill is constructed having blades 18.7 feet long. The length of the blades will be the radius of the circle which the windmill will sweep. What is the circumference of the circle which the windmill will sweep? (Use 3.14 for ?.)
A. 117.436 ft B. 113.696 ft C. 56.848 ft D. 58.718 ft
Solve the problem.The temperature on a December morning is -9°F at 6 a.m. If the temperature drops 3°F by 7 a.m., rises 9°F by 8 a.m., and then drops 2°F by 9 a.m., find the temperature at 9 a.m.
A. 5°F B. -23°F C. 23°F D. -5°F
Find an equation of the line.
A. y = -2x - 
B. y = 
x - 2
C. y = - 
x - 2
D. y = - 
x - 2