Simplify the expression. Assume all variables represent positive real numbers.4
+ 
A. 5
B. 16
C. 8
D. 4
+ 
Answer: C
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Provide an appropriate response.Solve the system of equations using the addition method:-3x + y = 13x - 7y = 29
A. x = 5, y = 16 B. x = -5, y = -14 C. x = -2, y = -5 D. x = 2, y = 5
Solve the problem.The sum of a student's three scores is 219. If the first is 12 points more than the second, and the sum of the first two is 24 more than twice the third, what was the first score?
A. 83 points B. 53 points C. 65 points D. 71 points
Use the percent proportion to answer the question. Round your answer to the nearest tenth of a percent, if necessary.72.7 feet is what percent of 9 feet?
A. 8078.0% B. 12.4% C. 1.2% D. 807.8%
Round the number to the specified place value.The moon is the nearest neighbor to the earth. The circumference of the moon is about 6890 miles. Round this number to the nearest thousand.
A. 6800 miles B. 7000 miles C. 6000 miles D. 6900 miles