Find the domain of the function.f(x) = -8x + 8
A. (-?, ?)
B. (-?, 0) ? (0, ?)
C. (0, ?)
D. (-8, ?)
Answer: A
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Solve the problem.Assume that the sales of a certain appliance dealer are approximated by a linear function. Suppose that sales were $14,000 in 1982 and $68,000 in 1987. Let 
represent 1982. Find the equation giving yearly sales 
.
A. S(x) = 10,800x + 68,000 B. S(x) = 10,800x + 14,000 C. S(x) = 54,000x + 14,000 D. S(x) = 54,000x + 68,000
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 29 mpg, where as at an average speed of 35 mph, her car rates 19 mpg. Find a linear function 
whose input is the speed in miles per hour and whose output is the gas mileage in miles per gallon.
A. f(x) = 
x + 89
B. f(x) = 
x + 31
C. f(x) = - 2x + 31
D. f(x) = - 2x + 89
Add or subtract as indicated.(7x2 - xy - y2) + (x2 + 9xy + 6y2)
A. 8x2 + 10xy + 7y2 B. 7x2 + 9xy + 6y2 C. 6x2 - 10xy - 7y2 D. 8x2 + 8xy + 5y2
Find the least common denominator for the expression.
+ 
A. (3x + 5)(4x + 3) B. (3x + 5)(4x + 3)(x + 3)2 C. 3x2(-5x + 3) D. (3x + 5)(4x + 3)(x + 3)