(4 points) You're on a desert island and you find a treasure map that reads, "Starting at the rock with the skull carved on its side, I walk northward for two hours. Every ten minutes, I measure my speed in miles per minute. .." and there's a formula: 12 10k 10 1 + (10k)2 k=1 Physically, explain what this sum is approximationg. (Use the language of definite integrals, velocity, distance travelled, and so forth. )