#1**+1 **

We can solve this for the common ratio , r

-4 (r)^5 = -12500 divide both sides by -4

r^5 = 3125 take the 5th root of both sides

r = 5

So the missing terms are

-20 -100 -500 -2500

CPhill Jun 4, 2021

#2**+1 **

I got r = 625 because I multiplied 1/5 times both sides. That was what I was taught but it didn't seem right. Shouldn't performing the square root and multiplying by 1/5 give me the same answer?

Guest Jun 4, 2021