<span>Two cylinders are shown. One is 216in^3 and one is 343in^3. Divide the smaller number (216) by the larger number (343). The answer is .629. That means that the smaller figure is approximately 63% the size of the larger figure.</span>
There are (15 - 6) terms in between, therefore 9 terms in between. -8 to -62 ... there is a difference of 54 54 ÷ 9 = 6 Therefore it gets -6 each term. a6 = -8, a7= -14, a8 = -20 ......