An urn contains 8 red balls and some black balls. If one ball is drawn, the probability of drawing a black ball is 
. The number of black balls is:
A. 9
B. 10
C. 14
D. 18
Answer: B
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A mail truck must deliver packages to 5 different homes (A, B, C, D, and E). The trip must start and end at A. The graph below shows the distances (in miles) between locations. We want to minimize the total distance traveled.
How many different Hamilton circuits would we have to check if we use the brute-force algorithm? (Do not count the same circuit traveled backward.)
A. 12 B. 4 C. 30 D. 60 E. none of these
Translate the indicated expression.Linda passes a rest area on the highway. One-fourth of an hour later, Mark, traveling in the same direction, passes the same rest area. If t represents the amount of time it takes Mark to catch up to Linda, write an expression in terms of t that describes the amount of time Linda has traveled since passing the rest area.
A. 
B. 
- t
C. t - 
D. t + 
Simplify. Remember that we have assumed that radicands do not represent the square of a negative number.
A. 
+ 
B. 5y - 5
C. 
- 
D. 25y2 - 50y + 25
Solve the problem.The volume V of a given mass of gas varies directly as the temperature T and inversely as the pressure P. If 
when 
and 
what is the volume when 
and 
A. 159.3 in3 B. 169.3 in3 C. 199.3 in3 D. 239.3 in3