Please answer these questions and provide full workings and explanations.

5:46 PM Fri Dec 23 58% K + 5 10d = 2040 Page 5 of 12 d = 4 13. Determine the indicated sum for the arithmetic series given the following the values. a = 8, 16 = 68, 512 = ? 13 ) 2 marks 14. When an object is dropped from rest it falls about 5 m in the first second, 15 m in the second, second, 25 m in the third second, and so on. If a rock is dropped from a hot air balloon and takes 16 seconds to hit the ground, how high above the ground is the balloon? 14) 2 marks 15. Determine the sum of all the multiples of 4 between 1 and 999. 12 V + 15) 2 marks