Final answer:
To find out how many rides Evan can go on at the county fair, we need to solve a linear equation. The correct answer is that Evan can go on 40 rides.
Step-by-step explanation:
To determine how many rides Evan can go on, we need to set up and solve a linear equation. Let x represent the number of rides Evan can go on. The cost of admission and the cost per ride can be expressed as: $10 + 0.75x. Since Evan's parents gave him $40, the equation becomes:
$10 + 0.75x = $40
Subtracting $10 from both sides gives:
0.75x = $30
Dividing both sides by 0.75 gives:
x = 40
Evan can go on 40 rides, so option d) Evan can go on 48 rides is incorrect.