Need answers 17-18 please round to correct sig figs

Sample Problem Set continued 17. A new landfill has dimensions of 2.3 km x 1.4 km x 0.15 km. a. What is the volume in cubic kilometer? X10 b. What is the volume in cubic meters? X 10 c. If 250 000 000 objects averaging 0.060 m each are placed into the landfill each year, how many years will it take to fill the landfill? 18. A dietary calorie (C) is exactly equal to 1000 cal. If your daily intake of food gives you 2400 C. what is your intake in joules per day? ( 1 cal = 4. 184 J) X 10