Solve.If x is Sam's average speed when walking and x + 10 is his average speed when cycling, then the total time, T, for a trip involving 12 miles of cycling and 8 miles of walking is given by T = 
+ 
where T is in hours and x is in miles per hour. Find Sam's average walking speed if the total time for a trip is 5 hours.
A. 3 mph
B. 3.5 mph
C. 4 mph
D. 2 mph
Answer: D
Mathematics
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The graph of a function f is given. Use the graph to find the indicated value.f-1(1)
A. 3
B. 4
C. - 
D. 
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Factor the expression.
A. 
B. 
C. 
D. 
E. 
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Complete the identity.
= ?
A. tan (2?) + 2 tan2 ?
B. 
C. 2 tan ? + 2
D. 
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Translate the phrase into a mathematical expression. If needed, use x to represent "a number."The sum of -55 and a number.
A. -55x B. -55 C. -55 + x D. -55 - x
Mathematics