Question

If there were only 9 runners on the team last year,

how many female runners are on the team this year?
Explain how you found the answer.

Answer 1

There are 21 female runners on the team this year.

Explanation:

there

Answer 2

Answer: There are 21 female runners on the team this year.

Explanation:

The exercise is: "The number of runners on a marathon team this year Is 6 more than 4 times the number of runners on last year's team. Half of the runners this year are female and half are male. The model shows that the number of female runners can be represented by the expression
`(1)/(2)(4r+6)`. If there were only 9 runners on the team last year, how many female runners are on the team this year? "

You know that the following expression represents the number of female runners on the marathon team this year:

`(1)/(2)(4r+6)`

Based on the information given in the exercise, you can identify that "r" represents the number of runners on the marathon team last year.

So, if there were 9 runners on the marathonn team last year, you can identify that:

`r=9`

Then, in order to find the number of female runners on the team this year (if there were 9 runners on the team last year), you need to:

1. Substitute that value of "r" into the expression:

`(1)/(2)(4(9)+6)`

2. And finally, evaluate:

`(1)/(2)(36+6)=(1)/(2)(42)=(42)/(2)=21`

Therefore, there are 21 female runners on the team this year.