12. Ava received a helium filled balloon the morning of her birthday. The balloon contained 29 000 cm' of helium when she received it. By the end of each day, Ava's balloon loses 10% of its helium. What is the volume of helium left in Ava's balloon at the end of the 6th day after she received the balloon? Round your answer to the nearest cm'. (2 marks) 13. Determine r and the numerical value of each term given the following information about a geometric sequence: (4 marks) 1st Term 2nd Term 3'd Term X x+5 x+9 14. Leah set a personal goal to walk 10 000 km in four years. If Leah increased the number of kilometres she walked per week by 3% every week, how far did she walk in the first week? Round your answer to the nearest metro