Solve the problem.Sandy's bike got a flat tire and she must walk the rest of the way to work. The bike was being ridden at 
and Sandy walks at a speed of 4 mph. The distance from home to work is 22 mi, and the total time for the trip was 3 hr. How far did she have to walk?
A. 4 mi
B. 2 mi
C. 1 mi
D. 18 mi
Answer: A
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Solve the problem.The intensity I of light decreases from its value I0 as it passes a distance x through a medium. Given that 
where k is a constant depending on the medium, find x for 
and 
A. 2.690 cm B. 0.598 cm C. 1.83 cm D. -2.690 cm
Solve the problem.The gross national product for the United States was 
. Round this amount to the nearest hundred-billion.
A. $51,200,000,000,000 B. $51,211,000,000,000 C. $51,210,000,000,000 D. $51,000,000,000,000
Determine whether the lines with the given slopes are parallel, perpendicular, or neither.
?
?
A. parallel B. perpendicular C. neither
Write the expression as a trigonometric function of a positive number.cos (-8.57)
A. sin 8.57 B. -cos 8.57 C. cos 8.57 D. -sin 8.57