Answer: $8.00
Explanation:
Let the cost of medium drinks be represented by d.
Therefore, the expression to represent the total amount that he spent will be:
= 3.50 + 3d
Total amount will then be:
= 3.50 + 3d
= $3.50 + 3($1.50)
= $3.50 + $4.50
= $8.00