Solve the problem.The number of traffic accidents has been decreasing in a certain county each year. The data is shown in the table for several recent years. The set of data can be approximated with a linear equation.
Find an equation of the line. Then use the equation to predict the number of traffic accidents in this county in 2021.
A. 313 accidents
B. 379 accidents
C. 339 accidents
D. 365 accidents
Answer: C
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Solve the problem.A student is told to answer any 7 out of 10 questions on an exam. In how many different ways can he choose the 7 questions to answer?
A. 720 B. 10,000,000 C. 120 D. 21
The following data are the number of social network friends for nine random users.76?91?123?63?106?211?84?111?46(a) Find the mean, median, and mode for the data. Round the value of the mean to the nearest whole number, if necessary.(b) A new user opens a social network account starting with 19 friends. Add this data to the data set and find the new mean, median, and mode for the data. Round the value of the mean to the nearest whole number, if necessary.
A. (a) mean: 93, median: 111, mode: 111; (b) mean: 85, median: 101, mode: 111 B. (a) mean: 101, median: 91, mode: no mode; (b) mean: 101, median: 111, mode: no mode C. (a) mean: 93, median: 111, mode: 111; (b) mean: 91, median: 111, mode: 111 D. (a) mean: 101, median: 91, mode: no mode; (b) mean: 93, median: 101, mode: no mode
Evaluate.Given f(x) = 2x2 + 5x + 1, find f(-2).
A. -1 B. -2 C. 14 D. -13
Determine whether the function is one-to-one.h(x) = 
x - 
A. One-to-one B. Not one-to-one