Perform the indicated operation and simplify.
+ 
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.The average life (in months) of an automobile battery is 4 months. If the battery life is exponentially distributed, find the probability that the life of a randomly selected battery is greater than 6 years.
A. 0.0558 B. 0.1942 C. 0.2231 D. 0.7769
Determine whether the infinite geometric series converges or diverges. If it converges, find its sum.
A. Converges; 16
B. Converges; 12
C. Converges; 4
D. Converges; 
Simplify the expression. Assume that all variables are positive when they appear.
A. 4x6y8 B. 16x6y8 C. -4x9y12 D. -4x6y8
Solve. If necessary, round percents to the nearest tenth, dollar amounts to the nearest cent, and all other numbers to the nearest whole.In a recent survey of 750 people, 15 said that their favorite color of car was blue. What percent of the people surveyed liked blue cars?
A. 2% B. 51% C. 3% D. 50%