Simplify the expression by combining like terms.-5x - 7.6y + 13.1x - 3.6y - 8.1x + 11.2y
A. 10.1x - 6.2y
B. 0
C. -10.1x + 6.2y
D. 10.1x + 6.2y
Answer: B
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Perform the indicated operation.
A. -9 B. 9 C. 7 D. -7
Solve the problem.There are currently 60 million cars in a certain country, decreasing by 4.3% annually. How many years will it take for this country to have 31 million cars? (Round to the nearest year.)
A. 2 years B. 16 year(s) C. 7 year(s) D. 78 years
Evaluate the expression.(-7)2
A. -14 B. -49 C. 14 D. 49
A pet store would like to use a survey to determine which factors are most important to cat owners in determining the brand of cat food that they purchase. ? Decide on a reasonable means for conducting the survey to obtain the desired information. ?
A. Survey 1000 persons whose names are chosen from the local telephone directory. B. Survey 1000 cat keepers by randomly choosing from a list of pets keepers. C. Survey 1000 random people of different age, sex, nationality, and so on. D. Survey 1000 random people in the street. E. None of these means are reasonable.