Rewrite the fractions using the least common denominator.
and 
A. 
and 
B. 
and 
C. 
and 
D. 
and 
Answer: D
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Add or subtract. Simplify if possible.
- 
A. 
B. 
C. 
D. 
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 785. Find a linear function, S(t), which fits this data, and which expresses score as a function of time. Use this function to predict an average score for persons taking a 56-hour review course. Round your answer to the tenths place.
A. 720.0 B. 741.3 C. 731.5 D. 727.3
Solve the problem.You have 76 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side along the river, find the length and width of the plot that will maximize the area.
A. length: 38 ft, width: 38 ft B. length: 19 ft, width: 19 ft C. length: 57 ft, width: 19 ft D. length: 38 ft, width: 19 ft
Find the reciprocal.
A. 1
B. 8
C. 
D. 0