In 2005, 120 students at Lincoln High School had smartphones. By 2010, 345 students in the same school had smartphones. Which of the following best describes the annual rate of change in the number of smartphones students had from 2005 to 2010 at Lincoln High School?
Correct answer: B. The average increase in the number of smart phones per year is 45
- A. The average increase in the number of smart phones per year is 40
- B. The average increase in the number of smart phones per year is 45
- C. The average increase in the number of smart phones per year is 50
- D. The average increase in the number of smart phones per year is 55
Explanation
We have to find the increase in n.o of students per year with the change of 5 years Students having phone in 2005:120 Students having smartphones in 2010: 345=345 - 120 =225 =225/5 Increase for each year= 45 Hence, Option B is the correct answer.
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