Use a system of linear equations to solve the exercise.Julie and Eric row their boat (at a constant speed) 21 miles downstream for 3 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 7 hours. Find the rate of the current.
A. 5 mph
B. 3 mph
C. 2 mph
D. 1.5 mph
Answer: C
Mathematics
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Evaluate or simplify the exponential expression.-5-3
A. -125
B. 
C. 125
D. - 
Mathematics
Find the reciprocal, if it exists.- 
A. 1
B. 
C. - 
D. 
Mathematics
Complete the table which corresponds to the given circle graph by listing the percent for each category as well as the number of items in that category.The circle graph below shows the votes received by each candidate in the election for student council president. 
A. 
B. 
C. 
D. 
Mathematics
Find the absolute value.
A. 
B. 
C. 0
D. 
Mathematics