Final answer:
The total cost of printing Logan's reports can be expressed as the sum of the costs of each report type. The expression 660x represents the cost in cents for 20 copies of both 15-page and 18-page reports. Any expression other than 660x does not correctly represent the total printing cost.
Step-by-step explanation:
Logan needs to calculate the total cost of printing a number of reports. He has two types of reports, one being 15 pages and the other 18 pages, and he needs 20 copies of each. Since each page costs 'x' cents to print, we can calculate the cost for each type of report and then sum them up to find the total cost.
For the 15-page report: 20 copies × 15 pages/copy × x cents/page = 300x cents.
For the 18-page report: 20 copies × 18 pages/copy × x cents/page = 360x cents.
The total cost to print all reports would be the sum of the cost for each report type: 300x cents + 360x cents = 660x cents.
Any expression that does not equal 660x would not represent the total cost of Logan's reports.