Chapter 4, Problem 8MCQ

a.

To determine

To find: Estimate the number of smart phones if there are 1450 students.

Answer to Problem 8MCQ

The number of smart phones is approximately 847(when it is rounded to nearest whole number).

Explanation of Solution

Given information: The number of students at Jefferson school has Smart phone is represented by $y=0.482x+148$ . Where ‘ x’ is number of students.

Calculation:

Let’s plug in x as 1450 into the given equation and simplify.

  $y=0.482(1450)+148$

Let’s simplify the right side of the equation.

  $y=698.9+148$

  $y=846.9$

Conclusion: The number of smart phones is approximately 847(when it is rounded to nearest whole number).

b.

To determine

To find: Mathematical practice did we used to solve this problem.

Answer to Problem 8MCQ

The problem used substitution, multiplication property of equality and addition property of equality.

Explanation of Solution

Given information: $y=0.482(1450)+148$

Firstly x is substituted 1450 then multiplied with the 0.482.Finally added this result to 148.