If i wanted to write an equation showing the relationship btw. the total cost (C) and the number of credit hours taken, (X) would this be right:

$200 per credit hour
$90 fees
C = 200x + 90

yes, correct.

thank you!

Yes, you are correct. The equation C = 200x + 90 represents the relationship between the total cost (C) and the number of credit hours taken (x) given the information you provided.

To explain how this equation is derived:

1. The $200 per credit hour represents the cost per credit hour. So, for each credit hour taken, the cost would be $200x.
2. The $90 represents additional fees that are not dependent on the number of credit hours taken. These fees are added to the cost per credit hour.
3. By summing up the cost per credit hour ($200x) and the additional fees ($90), we get the total cost (C).
Total cost (C) = Cost per credit hour ($200x) + Additional fees ($90)

Therefore, the equation C = 200x + 90 correctly represents the relationship between the total cost and the number of credit hours taken.