Question

Can anyone help me solve 0.1,0.5,0.9,1.3​

Answer 1

`(14)/(5)` or 2.8

To find
`S_4` we use formula:

`S_n=(n)/(2)*(2a_1+(n-1)*d)`

D =
`(2)/(5)`

`a_1=(1)/(10)`

`n=4`

Hope this helps!!!