The three term of a GP is 20 and 8 term is 640 find the common ratio. The first term and 10 term of a GP

Answer 1

I will assume you mean:
the third term of a GP is 20 and the 8th term is 640, or else you sentence makes no sense

ar^2 = 20
ar^7 = 640
divide them:
r^5 = 32
r = 2
now you can find a
and then ar^9, which is the 10th term

Answer 2

pls I really don't understand how you solve for this equation r^5 = 32 to derive at 2 as your answer 🤔🤔