Here is the problem:
Arthur is going for a run. From his starting point, he runs due east at 10 feet per second for 230 feet. He then turns, and runs north at 12 feet per second for 400 feet. He then turns, and runs west at 7 feet per second for 70 feet.
Express the (straight-line) distance from Arthur to his starting point as a function of t, the number of seconds since he started.
I can't figure out what I am doing wrong for the third part? Thank you!