Answer: The cost of 15 meals at $7.25 per meal is:
15 x $7.25 = $108.75
To find the cost including the 5% sales tax, we need to add 5% of the cost to the cost:
5% of $108.75 = 0.05 x $108.75 = $5.44
So the total cost, including the sales tax, is:
$108.75 + $5.44 = $114.19
Therefore, the coach's total cost for 15 meals, including sales tax, will be $114.19.