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.
A. y = -78x + 625
B. y = -78x + 615
C. y = 78x + 625
D. y = -88x + 625
Answer: B
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Translate to an equation, then solve.The difference between two positive numbers is 20. One number is three times the other number. Find the numbers.
A. 30 and 50 B. 20 and 30 C. 10 and 30 D. 10 and 20
Solve the problem.The profit (in millions of dollars) for Allied Manufacturing can be approximated by 
where x is the year 1989 ? x ? 2009. Approximate the average rate of change over a 7-year period. Round your answer to three decimal places when appropriate.
A. 2.394 million dollars B. 4.404 million dollars C. 1.894 million dollars D. 3.964 million dollars
Simplify the radical expression. Assume that all variables represent positive real numbers.
A. 7xy
B. 7xy
C. 3xy
D. 7xy
Use the given feasible region determined by the constraint inequalities to find the maximum possible value of the objective function.f = 3x + 11y subject to the constraints 
A. 323 B. 363 C. 383 D. 343