Solve the problem.The formula 
models the safe maximum speed, v, in miles per hour, at which a car can travel on a curved road with radius of curvature, r, in feet. A highway crew measures the radius of curvature at an exit ramp as 810 feet. What is the maximum safe speed?
A. 81 mph
B. 50 mph
C. 42 mph
D. 45 mph
Answer: D
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Identify the numerator and the denominator of the fraction.
A. numerator: 
; denominator: 3a
B. numerator: 2ya; denominator: 3
C. numerator: 2y; denominator: 3a
D. numerator: 3a; denominator 2y
Find area of figure. Round to the nearest hundredth if necessary.
(Use 3.1 4 for ? .)
A. 33.59 in.2 B. 59.87 in.2 C. Not enough data D. 40.64 in.2
Solve the system using the matrix inverse method. 7x - y + 8z = 26-5x + 2z = 1 5y + z = 28
A. {(1, 3, 5)} B. ? C. {(-1, 5, 2)} D. {(1, 5, 3)}
Solve the problem.The population of a certain species of fish introduced into a lake is described by the logistic equation G(t) = 
,where G(t) is the population after t years. Find the point at which the growth rate of this population begins to decline.
A. (2.65, 6000) B. (3.56, 9000) C. (5.13, 9000) D. (3.81, 6000)