Last year Ali biked c miles. This year, he biked 261 miles. Using c write an expression for the total number of miles he biked

The total amount Ali biked was over two years. To find that amount, you add the amount he biked each year. Since he biked 261 miles in one year and c miles in the other, the total amount of miles is 261 + c. That would be the expression used to describe the total number of miles.