The correct answers are:
53 is the cost of the meal and x is the tip percentage.
Step-by-step explanation:
When we add a tip to the total cost of a meal, we pay 100% of the cost of the meal plus an additional amount. In decimal form, this gives us 1 + the decimal for the tip percent. This is the (1+x) in this expression.
We multiply this (1+x) by the cost of the meal. This means that in this case, 53 is the cost of the meal.