Tony's baby sitting service charges $2.50 per day plus $1.75 an hour. What is the cost of a seven hour babysitting job?

$14.75

Here is the process.

2.50 + 7(1.75) = 14.75

To calculate the cost of a seven-hour babysitting job using Tony's service, you need to add the cost per day and the cost per hour.

Step 1: Calculate the cost per day.
Tony's service charges $2.50 per day, so the cost per day is $2.50.

Step 2: Calculate the cost per hour.
Tony's service charges $1.75 per hour.
Since the job duration is seven hours, multiply the cost per hour by seven: $1.75 * 7 = $12.25.

Step 3: Calculate the total cost.
To calculate the total cost, you need to add the cost per day and the cost per hour.
Total cost = cost per day + cost per hour
Total cost = $2.50 + $12.25
Total cost = $14.75

Therefore, the cost of a seven-hour babysitting job with Tony's service is $14.75.