Write the expression with only positive exponents. Assume all variables represent nonzero numbers. Simplify if necessary.r-7
A. r1/7
B. -r7
C. - 
D. 
Answer: D
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Use a calculator to find the value. Give answers as real numbers and round to 4 decimal places, if necessary.cos (cos-1(-0.9372))
A. -0.9372
B. 0.9372
C.
| 0 | .4686 |
D. -0.4686
Solve the problem.The table below shows the probabilities of a person accumulating specific amounts of credit card charges over a 12-month period. Find the probability that a person's total charges during the period are $600 or more. 
A. 0.95 B. 0.84 C. 0.16 D. 0.05
State the name of the property illustrated.3 ? (19 ? 2) = (19 ? 2) ? 3
A. Distributive property of multiplication over addition B. Commutative property of multiplication C. Associative property of multiplication D. Identity property of multiplication
Solve the problem.The formula v = 
models the safe maximum speed, v, in miles per hour, at which a car can travel on a curved road with radius of curvature, r, in feet. A highway crew measures the radius of curvature at an exit ramp as 160 feet. What is the maximum safe speed?
A. 25 mph B. 16 mph C. 17 mph D. 20 mph