Write the expression using only positive exponents. Simplify if possible.4-3
A. 
B. 64
C. -64
D. 
Answer: D
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Determine if matrix A is invertible.A = 
A. Not invertible B. Invertible
Factor completely. If the polynomial cannot be factored, write prime.x2 - x - 40
A. (x - 5)(x + 8) B. (x - 40)(x + 1) C. (x + 5)(x - 8) D. Prime
Solve the problem.A repair company's charge for repairing a certain type of copy machine fits the model 
where y is the amount charged in dollars and x is the number of minutes the repair person is on the job. How many minutes would it take for the cost of repair to reach $120? (Round to the nearest minute.)
A. 187 min B. 12 min C. 271 min D. 118 min
Use a graphing calculator to plot the data and find the quadratic function of best fit.An engineer collects data showing the speed s of a given car model and its average miles per gallon M. Use a graphing calculator to plot the scatter diagram. What is the quadratic function of best fit?
A. M(s) = -0.0063x2 + 0.720x + 5.142 B. M(s) = 0.063x2 + 0.720x + 5.142 C. M(s) = -0.631x2 + 0.720x + 5.142 D. M(s) = -6.309x2 + 0.720x + 5.142