Solve the problem.On a test, Mark answered 81 questions incorrectly or 36% of the total number of questions on the test. How many questions were on the test?
A. 225 questions
B. 44 questions
C. 0.44 questions
D. 2250 questions
Answer: A
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Solve.The velocity v of a falling object (ignoring air resistance) is directly proportional to the time t of the fall. If, after 4 seconds, the velocity is 128 feet per second, what will its velocity be after 9 seconds?
A. 
foot/second
B. 288 feet/second
C. 133 feet/second
D. 285 feet/second
Find the second derivative of the function.
?
?
A. 
B. 
C. 
D. 
Solve. Graph the solution on a number line, and express it in interval notation.x + 17 ? - 
or
x + 17 > 
A. - 
? x < - 
, 
B. x < -18 or x > -16, (-?, -18) ? (-16, ?)
C. x ? 
or x > 
, 
? 
D. x ? - 
or x > - 
, 
? 
Use dimensional analysis to convert the unit of length.8.9 miles to feet
A. 3916 ft B. 46,992 ft C. 15,664 ft D. 1958 ft