Your friend decided to join a bmx course so he can race with his friends. The courses charges $7 per race after the membership fee. Your friend has raced 28
times and paid a total of $210, including the membership fee. What is the
membership fee? How much would he pay if he races 39 times? *

He would pay $287 if he races 39 times

Thus, the membership fee is $14.

Step-by-step explanation:

Linear Modeling

The situation described in the problem can be modeled as the equation of a line which has the form:

Where y is the cost of the course, x is the number of races, a is the cost per race, and b is the membership fee.

We know the course charges $7 per race, so a=7. Since your friend has raced x=28 times and paid y=210, we can find the value of b:

Operating:

b=14

Thus, the membership fee is $14.

The linear model is now:

If he races x=39 times, your friend would pay:

y=287

He would pay $287 if he races 39 times

answer: i believe its b. if you sound out the sentences that sounds wrong.