#### Answer

The total cost is $4.45, and this uses the Associative property of addition.

#### Work Step by Step

To find the total cost, we need to add the cost of the sandwich, apple, and juice, and the order of these do not matter according to the Associative property of addition.
To calculate the total cost:
let a represent the cost of apples = 0.45
let b represent the cost of juice = 1.05
let c represent the cost of sandwiches =2.95
Total cost= a + b + c
Total cost= 0.45 + 1.05 + 2.95
Total cost= $4.45