Solve the problem.The dosage for Carboplatin Chemotherapy drugs depends on several parameters of the drug as well as the age, weight, and sex of the patient. For a male patient, the formulas giving the dosage for a certain drug are: D = A(c + 25)and c = 
,where A and x depend on which drug is used, D is the dosage in milligrams (mg), c is called the creatine clearance, y is the patient's age in years, and w is the patient's weight in kg. For a 50 year old man, find an expression for 
in terms of A and x.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
+ 25A
Answer: B
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Solve the problem.In 1990, the population of a country was estimated at 4 million. For any subsequent year the population, P(t) (in millions), can be modeled by the equation 
where t is the number of years since 1990. Estimate the year when the population will be 21 million.
A. approximately the year 2088 B. approximately the year 2093 C. approximately the year 2016 D. approximately the year 2041
Decide whether the statement is true or false.The circle with equation (x + 4)2 + (y - 4)2 = 64 has center at (4, -4).
A. True B. False
Solve the problem.A rectangle is shown below. The area of the rectangle is also given. Find the value of the indicated variable.
A. x = 56 B. x = 14 C. x = 5 D. x = 11
Solve the problem.Suppose 
is a mathematical model for actual time as a function of estimated time, where f(x) represents actual time (in minutes), x represents estimated time (in minutes), and m and b are constants. If 
and b = -1.4, find f(x) when x is 30 minutes.
A. 29.44 min B. 10.6 min C. 30.56 min D. 13.4 min