The answer is causation only because as the miles walked increases the number of calories burned also increases. Causation also exist because the miles walked is causing the calories to be burned.
The correct answer is choice C. Here is the reason. If you substitute the information into the formula this is what it would be: A = bh/2 13 = x (6x + 1)/2 13 = (6x^2 + x)/2 26 = 6x^2 + x 0 = 6x^2 + x - 26
