Solve the problem.The change in a certain engineer's salary over time can be approximated by the linear equation 
where y represents salary in dollars and x represents number of years on the job. According to this equation, after how many years on the job was the engineer's salary $55,000?
A. 7 years
B. 6 years
C. 4 years
D. 5 years
Answer: D
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Write the number in scientific notation. One milligram is about 0.015430 grain.
A. 0.1543 × 10-1 B. 15.43 × 10-3 C. 1.543 × 10-2 D. 1.543 × 10-3 E. 0.015430 × 10-2
Solve the problem.The number of visitors for the first three to four years to a tourist attraction can be approximated by 
where x is the number of months after opening for the first time. Find the number of visitors 4 months after opening.
A. 70 B. 90 C. 52 D. 54
Provide an appropriate response.Write as an algebraic expression: Half of w
Fill in the blank(s) with the appropriate word(s).
Solve the problem.A freight train leaves a station traveling at 32 km/h. Two hours later, a passenger train leaves the same station traveling in the same direction at 52 km/h. How long does it takes the passenger train to catch up to the freight train?
A. 3.2 hr B. 2.2 hr C. 4.2 hr D. 5.2 hr