Answer:5m²Step-by-step explanation:Solution: 1. Calculate the area of the original garden: The original garden was 5 m by 5 m. Area of original garden = 5m x5m=25m² 2. Calculate the area of the new garden: Mr. Salas added 1 m to one side, making it 6 m by 5 m. Area of new garden =6m x5m=30m² 3. Calculate the increase in the garden's area: Increase in area = Area of new garden - Area of original gardenIncrease in area = 30m² - 25m²= 5m² Answer: The increase in the garden was 5m²