To solve this problem, we need to set up an equation using the information given. Let's use the variable x to represent the number of pounds of apples that Ryan bought.
The cost of the loaf of bread is $3.95, so we subtract this from the total amount spent: $10.40 - $3.95 = $6.45.
The cost of the apples is $1.29 per pound, so we can multiply this by the number of pounds to get the total cost of the apples: $1.29x.
We can now set up the equation: $6.45 = $1.29x.
To solve for x, we divide both sides of the equation by $1.29: x = $6.45 รท $1.29.
Simplifying this, we find that x = 5. Therefore, Ryan bought 5 pounds of apples.
So the correct response is: 1.29x + 3.95 = 10.40, Ryan bought 5 pounds of apples.