Final answer:
Darren's approximate percentage increase in height is 9%.
Step-by-step explanation:
To find the approximate percentage increase in height, you can use the formula:
Percentage increase = (New height - Original height) / Original height * 100
In this case, Darren's original height was 33 inches, and his new height was 36 inches. Plugging these values into the formula:
Percentage increase = (36 - 33) / 33 * 100 = 3 / 33 * 100 = 0.09 * 100 = 9%
Therefore, Darren's approximate percentage increase in height is 9%.