The number of calories burned, "C", varies directly with the time spent exercising, "t". When James runs for 2 hours, he burns 800 calories. Which of the following equations shows this direct linear variation?
A. C=t
B. C=2t
C. C=400t
D. C=800t
C - the number of calories burned; t - the time spent exercising ( in hours ). For 2 hours he burns 800 calories. For 1 hour he burns 400 calories. Answer: C ) C = 400 t
