Final answer:
The remaining length of the candle in inches, represented as r, in terms of the burned length of one end of the candle, x, is given by the formula r = L - x, where L is the original length of the candle.
Step-by-step explanation:
The student is asked to write a formula that expresses the remaining length of a candle, designated as r, in terms of the length burned from one end, referred to as x. Assuming the candle started as a certain initial length, let's say L, the relationship between the burned length and the remaining length can be represented by the formula r = L - x. This formula simply states that the remaining length is the original length minus the length that has been burned.