Solve the problem.The cost C of an international call is given by the formula 
where 
Find the duration of a call that costs $5.57 by replacing C in the formula with 5.57 and solving the resulting equation.
A. 23 minutes
B. 7 minutes
C. 16 minutes
D. 30 minutes
Answer: D
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Solve the problem.Your company uses the quadratic model y = -4.5x2 + 150x to represent the average number of new customers who will be signed on (x) weeks after the release of your new service. How many new customers can you expect to gain in week 24?
A. 3492 customers B. -792 customers C. 504 customers D. 1008 customers
Solve the problem.A certain electronic air cleaner is capable of filtering x liters of air per second and the percentage of the contaminants that are removed from the air may be calculated by 
where 
Graph f in [0,85,5] by 
Then, use the intersection-of-graphs method to estimate the x-values where 75% to 95% of the pollutants are removed.
height="180" width="180" />
A. 75% to 95% are removed when
about 36 to 47 liters of air are
filtered.
B. 75% to 95% are removed when
about 25 to 33 liters of air are
filtered.
C. 75% to 95% are removed when
about 45 to 56 liters of air are
filtered.
D. 75% to 95% are removed when
about 27 to 36 liters of air are
filtered.
Write the given terms as like radicals, if possible. If any variables exist, assume that they are positive.
, 
, 
A. 2
, 3
, 4
B. 
, 2
, 3
C. 
, 4
, 9
D. Not possible
Follow the rules for working with measurements.Gravel is piled in the shape of a cone. The circumference of the base is 225 ft. The slant height is 46 ft.Find the volume of gravel.V = __________ ft3If the gravel weighs 3,200 lb/yd3, how many 20-ton truckloads are needed to transport the gravel?__________ truckloads
What will be an ideal response?