Solve the problem.A driver wants to gauge the fuel efficiency of her vehicle at speeds of 30 mph and above. She notices that traveling at an average speed of 30 mph results in a rating of 39 mpg, where as at an average speed of 40 mph, her car rates 24 mpg. Find an equation to model the gas mileage (y) for an average speed of x mph.
A. y = - 
x + 6
B. y = 
x + 6
C. y = 
x + 84
D. y = - 
x + 84
Answer: D
Mathematics
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Determine whether the graph has a Hamilton circuit.
A. No B. Yes
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Find a formula for the nth term of the sequence.The sequence 0, 
, 0, 
, 0, . . . (alternating 0's and 
's)
A. an = 
B. an = 
C. an = 
D. an = 
Mathematics
Check to see if the given number is a solution for the equation.x3 + 6x2 = - 8(x2 + 6x); check x = 0
A. 0 is a solution. B. 0 is not a solution.
Mathematics
x? = 0.5x ? 0.2xy , y? = ?0.4y + 0.1xy
Let x and y represent the populations (in thousands) of two species that share a habitat. For each system of equations, find and assess the stability of the equilibrium points. Remember that, for real populations, both x0 and y0 must be nonnegative for ( x0 , y0) to be an equilibrium point.
Mathematics