Solve the problem.The position of an object moving in a straight line is given by s = t2 - 8t, where s is in feet and t is the time in seconds the object has been in motion. How long (to the nearest tenth) will it take the object to move 19 feet?
A. 9.7 sec
B. 9.9 sec
C. 20.0 sec
D. 20.9 sec
Answer: B
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A radioactive substance is decaying exponentially with yearly decay factor 0.91. What is the decade decay factor? Round your answer to two decimal places. ?
A. 0.09 B. 0.99 C. 9.10 D. 0.39
Solve the problem.The rate of water usage for a business, in gallons per hour, is given by 
where t is the number of hours since midnight. Find the average rate of water usage over the interval 
A. 3.78 gallons per hour B. 4.37 gallons per hour C. 0.37 gallons per hour D. 3.63 gallons per hour
Add. Do not use a number line except as a check.- 
+ 
A. - 
B. - 1
C. 1
D. 
Perform the indicated operation. Write the answer in scientific notation.
A. 2.70 × 10-4 B. 5.4 × 10-4 C. 5.4 × 10-10 D. 2.70 × 10-10