Final answer:
To find out how many pictures Todd ordered, we can use the equation 7.50 * p + 4.25 = 116.75 to solve for p. Todd ordered 15 pictures.
Step-by-step explanation:
To find out how many pictures Todd ordered, we can set up an equation.
Let p represent the number of pictures Todd ordered.
The cost of each picture is $7.50, so the cost of p pictures is 7.50 * p.
There is also a one-time shipping fee of $4.25, so the total cost of Todd's order before tax is 7.50 * p + 4.25.
Given that the total cost is $116.75, we can write the equation:
7.50 * p + 4.25 = 116.75
To solve for p, we can subtract 4.25 from both sides:
7.50 * p = 112.50
Then divide both sides by 7.50:
p = 15
Todd ordered 15 pictures.