Solve the problem.The system of equations 
= (-4 + 5y)x and 
= (-4 + x)y describes the growth rates of two symbiotic (dependent) species of animals (such as the rhinoceros and a type of bird which eats insects from its back). What is necessarily true of the two populations at the equilibrium points?
A. They are both at a maximum.
B. They are both at a minimum.
C. Both populations equal zero.
D. They both remain constant over all time.
Answer: D
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Find the value of the objective function at each corner of the graphed region. Use this information to answer the question.
Objective Function z = 4x + yWhat is the maximum value of the objective function?
A. 50 B. 35 C. 13 D. 32
Find a decimal approximation for the fraction or mixed number, rounded to the given place value. 
; tenths
A. 3.4 B. 0.3 C. 2.4 D. 3.43
Solve the problem.The graph shows an idealized linear relationship for the average monthly payments (in dollars) to retirees from 2000 through 2004. Use the midpoint formula to estimate the payment for 2002.Average Monthly Payments to Retirees
a = $452; b = $524
A. $488 B. $36 C. $524 D. $500