Final answer:
The cost of each pizza is \$8.99, found by subtracting the remaining money (\$3.03) from the total (\$30) and dividing by the number of pizzas (3). This corresponds to option (a).
Step-by-step explanation:
Molly had \$30 to spend on pizzas, and after buying 3 pizzas, she was left with \$3.03. To find the cost of each pizza, we need to calculate how much money she spent on all pizzas and then divide that amount by the number of pizzas. The total amount spent on 3 pizzas is \$30 - \$3.03 = \$26.97. When we divide \$26.97 by 3, we get the cost of each individual pizza.
\[ \text{Cost per pizza} = \frac{\text{Total cost for 3 pizzas}}{\text{Number of pizzas}} \]
\[ \text{Cost per pizza} = \frac{\text{\$26.97}}{3} \]
\[ \text{Cost per pizza} = \text{\$8.99} \]
Therefore, the cost of each pizza is \$8.99, which corresponds to option (a).