#1**+3 **

8) Let the first term = a

Then we know that the second term = ar = 42 where r is the common difference

And the sixth term = 6302.625 = ar^5

So.....we have the following equations

ar = 42

ar^5 = 6302.25 divide the ssecond equation by the first and we have

r^4 = 6302.625 / 42

r = ( 6302.625 / 42 )^1/4 = 3.5

To find the first term we can solve this

ar = 42

a (3.5) = 42

a = 42/3.5 = 12 = first term

CPhill Apr 14, 2019