Question

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

Answer 1

Answer:

$\frac{14}{5}$ or 2.8

To find $S_4$ we use formula:

$S_n=\frac{n}{2}*(2a_1+(n-1)*d)$

D = $\frac{2}{5}$

$a_1=\frac{1}{10}$

$n=4$

Hope this helps!!!