Use scientific notation to solve the problem.A light-year is the distance that light travels in one year. Find the number of miles in a light-year if light travels 1.86 x 105 miles per second.
A. 6.0 x 105 miles
B. 6.0 x 1014 miles
C. 6.0 x 107 miles
D. 6.0 x 1012 miles
Answer: D
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Solve the problem.An electric pole 15 ft high casts a shadow that is 7.5 ft long. What is the length of the shadow of a 22-ft pole?
A. 2 ft B. 8 ft C. 11 ft D. 14 ft
Find the gross earnings. Use the overtime premium method. Overtime is paid at time-and-a-half for all hours over 40. 
A. $745.08 B. $496.72 C. $567.68 D. $565.68
Simplify the expression. Assume that all variables are positive.
? 
A. 35
B. 
C. 12
D. 
Solve the problem. Round to the nearest tenth, if necessary.Sue rowed her boat across and back Lake Bend in 3 hr. If her rate rowing back was 2 mph less than the rate rowing across, and if the distance each way was 7 mi, find her rate rowing across.
A. 1.5 mph B. 5.9 mph C. 3.7 mph D. 5.5 mph