Final answer:
The amount of sod needed to replace a triangular dead patch of grass measuring 4 feet wide and 11 feet long is calculated as 22 square feet.
Step-by-step explanation:
To calculate the amount of sod needed to replace a triangular dead patch of grass, we can use the formula for the area of a triangle, which is Area = 1/2 * base * height. In this case, the base of the triangle is given as 4 feet wide, and the height is 11 feet long. By substituting these values into the formula, the calculation would be Area = 1/2 * 4 feet * 11 feet, which equals 22 square feet.
Therefore, to replace the dead patch of grass, the student will need 22 square feet of sod.