Solve the problem.A formula for calculating the distance, d, one can see from an airplane to the horizon on a clear day is 
where x is the altitude of the plane in feet and d is given in miles. How far can one see in a plane flying at 20,000 feet? Round your answer to the nearest tenth mile, if necessary.
A. 12,200 mi
B. 172.5 mi
C. 1220 mi
D. 156.2 mi
Answer: B
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Evaluate the algebraic expression for the given values of the variables.10x - 7y, x = –4 and y = 10
A. 117 B. 110 C. 30 D. –103 E. –110
Solve the problem.On a certain map, 1 inch equals 40 miles. How many miles are in 2
inches?
A. 16 miles
B. 100 miles
C. 20
miles
D. 22 miles
Solve the problem.One of Sal's customers ordered items costing $6.38, $13.60, $15.29, and $22.21. If Sal's commission on each item is 30%, what is his total commission on this sale? Round to the nearest cent.
A. $10.58 B. $15.33 C. $12.66 D. $17.24
Find the function f given that the slope of the tangent line to the graph of f at any point 
and that the graph passes through the point (0, 3).
What will be an ideal response?