Final answer:
The length of the patio is 7.5 meters.
Step-by-step explanation:
The formula to find the area of a rectangle is Area = Length x Width. In this case, the area of the rectangular patio is given as 30 square meters and the width is given as 4 meters. Using the formula, we can determine the length of the patio by rearranging the equation to solve for length: Length = Area / Width. So, in this case, the length of the patio would be 30 / 4 = 7.5 meters.