Solve the problem.The concentration of a certain drug in the bloodstream t minutes after swallowing a pill containing the drug can be approximated using the equation 
where C(t) is the concentration in arbitrary units and t is in minutes. Find the rate of change of concentration with respect to time at 
minutes.
A. - 
units/min
B. - 
units/min
C. - 
units/min
D. - 
units/min
Answer: B
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The demand function for a certain make of replacement cartridges for a water purifier is given by
?
?
where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers' surplus if the market price is set at $1/cartridge. Round your answer to the nearest dollar.
?
CS = $__________
Fill in the blank(s) with the appropriate word(s).
Write the first four terms of the geometric sequence with the given first term, a1, and common ratio, r.a1 = - 
, r = -4
A. - 
, 
, 
, 
, . . .
B. - 
, 
, - 
, 
, . . .
C. - 
, 
, 
, 
, . . .
D. - 
, 
, 
, 
, . . .
Solve the problem.
Choose any two data points and use them to construct a linear equation that models the data, with x being Fahrenheit and y Celsius. Then use the equation to find the Celsius temperature corresponding to 113° Fahrenheit.
A. y = 
(x - 32); 45° Celsius
B. y = 
(x + 32); 261° Celsius
C. y = 
(x - 32); 146° Celsius
D. y = 
(x + 32); 81° Celsius
Write the fractions in lowest terms. Then determine whether the pair of fractions is equivalent or not equivalent.
and 
A. Equivalent B. Not equivalent