Question

Explicit equation for 5,10,20,40

Answer 1

5(2^x-1)

Explanation:

uh just take the first number and multiply it with the common difference

Answer 2

see explanation

Explanation:

These are the terms of a geometric sequence with n th term

`a_(n)` = a
`(r)^(n-1)`

Where a is the first term and r the common ratio

r =
`(10)/(5)` =
`(20)/(10)` =
`(40)/(20)` = 2

and a = 5, hence explicit equation is

`a_(n)` = 5
`(2)^(n-1)`