Final answer:
Robert is approximately 40.02 yards from the starting point. Therefore, the correct option is A).
Step-by-step explanation:
To find out how far Robert is from the starting point, we can use the Pythagorean theorem. Robert walked 20 yards north and then 30 yards west, forming a right triangle. The distance from the starting point is the hypotenuse of the triangle.
Using the Pythagorean theorem, we can calculate the distance as:
d = sqrt[(20^2) + (30^2)]
d = sqrt[400 + 900]
d = sqrt[1300]
d ≈ 40.02 yards
So, Robert is approximately 40.02 yards from the starting point. Which is close to 40, Therefore, the correct option is A).