Final answer:
To simplify the expression and write it with positive exponents, combine like terms and subtract exponents when the base is the same.
Step-by-step explanation:
The expression represents the price of gas per gallon that Patrick is going to pay. To simplify the expression and write the answer with positive exponents, we need to apply the laws of exponents. The expression can be simplified by combining the like terms. For example, if the variables in the numerator and denominator have the same base, we can subtract the exponents.
Let's assume that the expression is:
To simplify this expression, we can subtract the exponents when the base is the same. In this case, the base is 'a'.
Therefore, the simplified expression with positive exponents is .