Given that number of cans purchased by Andre = 10
Let cost of 1 can = $x
then cost of 10 can = 10x
Given that Andre recieved 25% discount
So the actual amount paid = 100% - 25% = 75%
that means He paid 75% of 10x
Now there is some shipping cost about $5.99
Then total cost will be = (75% of 10x) + 5.99
Total cost = 0.75*10x + 5.99
Total cost = 7.5x + 5.99
Hence required algebraic expression to represent the total cost of the tennis balls with the shipping cost is 7.5x + 5.99