Use technology to compute r, the correlation coefficient.The test scores of 6 randomly picked students and the number of hours they prepared are as follows: 
A. .6781
B. -.6781
C. -.2242
D. .2242
Answer: D
Mathematics
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Assume that variables represent positive real numbers. Replace the radical with rational exponents.
A. 
B. y3/2
C. 
D. y1/3
Mathematics
Perform the indicated operations and simplify the result. Leave the answer in factored form.
? 
A. 
B. 
C. 
D. 
Mathematics
Solve this problem.The average rate of speed of a car in heavy traffic on a highway is 15 miles per hour faster than a truck on the same highway. The time required for the truck to travel 270 miles is one more hour than for the car to travel 300 miles. What is the average rate of the car?
A. 50 miles per hour B. 45 miles per hour C. 65 miles per hour D. 60 miles per hour
Mathematics
Evaluate.1 + (-8) - 5 + (-8)
A. -10 B. -20 C. 6 D. -4
Mathematics