Solve the radical equation, and check all proposed solutions.
= 7
A. {121}
B. {45}
C. {53}
D. {49}
Answer: B
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Multiply. Write the answer in simplest form.2
? 4
? 5
A. 40
B. 40
C. 
D. 11
Find the length of the third side of the right triangle. Assume that c represents the length of the hypotenuse. Give an exact answer and, if appropriate, an approximation to three decimal places.a = 1, b = 7
A. c = 
; c ? 2.828
B. c = 
; c ? 6.928
C. c = 8
D. c = 
; c ? 7.071
At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of 0.9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are:Less than 15.2 seconds
A. 34% B. 68% C. 50% D. 16%
Add or subtract, if possible. Assume that all variables represent non-negative values. Simplify your answer. 8 
- 3xy 
A. 2x2y2
B. 5xy3
C. 5x2y3
D. 2 xy2