Solve the problem.Let d be the distance traveled (in miles) after a student has driven for t hours (not counting meal stops). Some pairs of values for t and d are shown in the table.
Estimate how long it took the student to travel 75 miles.
A. 2 hours
B. 2.5 hours
C. 3.5 hours
D. 1.5 hours
Answer: D
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Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where c is cost and x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 20 watches B. 36 watches C. 73 watches D. 39 watches
Graph. Label any intercepts and determine the slope of the line. If the slope is undefined, state this.x = 6
A. x-intercept: (0, 6), m: 0
B. x-intercept: (0, 0), m: 6
C. x-intercept: (6, 0), m: undefined
D. x-intercept: (6, 0), m: 
Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 
Express the graph shown using interval notation. Also express it as an inequality involving x.
A. (-?, 3) x < 3 B. [3, ?) x ? 3 C. (3, ?) x > 3 D. (-?, 3] x ? 3