Simplify the expression.
+ 
- 
A. 
B. 
C. 3
D. 
Answer: C
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Solve the problem.When a tow truck is called, the cost of the service is given by the linear function 
, where y is in dollars and x is the number of miles the car is towed. Find and interpret the slope and y-intercept of the linear equation.
A. m = 2; The number of miles the car is towed increases 2 miles for every dollar spent on the service. y-intercept: 80; The tow truck will tow the car 80 miles for no cost. B. m = 2; The cost of the service increases $2 every mile the car is towed. y-intercept: 80; The cost of the service is $80 if the car is not towed. C. m = 80; The number of miles the car is towed increases 80 miles for every dollar spent on the service. y-intercept: 2; The tow truck will tow the car 2 miles for no cost. D. m = 80; The cost of the service increases $80 every mile the car is towed. y-intercept: 2; The cost of the service is $2 if the car is not towed.
Use the REGRESSION feature on a graphing calculator.As the number of farms has decreased in South Carolina, the average size of the remaining farms has grown larger, as shown below. 
Let x represent the number of years since 1900. Use a graphing calculator to fit a quadratic function to the data. Round your answer to five decimal places.
A. y = 0.02536x3 + 1.21114 + 102.58741 B. y = 0.02536x2 + 1.21114 x + 102.58741 C. y = -.00114x3 + 0.19605x2 - 5.29775 + 143.55245 D. y = 0.02536x3 + 1.21114 x + 102.58741
Solve the system of equations by using the inverse of the coefficient matrix if it exists and by the echelon method if the inverse doesn't exist. 4x + 4y = 4 3x + 9y = 27
A. (-3, -4) B. (4, -3) C. (-3, 4) D. No inverse, no solution for system
Find the greatest common factor, GCF, of the expressions.64a8b3, 88a6b8
A. 8a6b3 B. 4a2b5 C. 8a8b8 D. 704a8b8