To calculate the total amount Rebecca paid for the eight air filters, we can use the expression you provided:
\[ (8 \times 16.95) - 7.50 \]
First, calculate the total cost of the eight air filters:
\[ 8 \times 16.95 = 135.60 \]
Next, subtract the coupon discount of $7.50 from the total cost:
\[ 135.60 - 7.50 = 128.10 \]
Therefore, Rebecca paid $128.10 for the eight air filters.