$\"\"$

The formula for total cost C (in dollars) is $\"\"$ where x is the number of league nights.

Solve $\"\"$ for x.

Subtract 25 from each side.

$\"\"$

Divide each side by 12.

$\"\"$

Cancel common terms.

$\"\"$ . $\"\"$

Substitute the values of $\"\"$ for C in the formula $\"\"$ .

If $\"\"$ then $\"\"$ .

If $\"\"$ then $\"\"$ . $\"\"$

(a) The value of $\"\"$ and (b) The number of league nights are 10, 13 and 15.