Find $I_{},I_{yy}$

by using

$y=\frac{{\displaystyle \underset{i=1}{\overset{n}{}}}{A}_i{y}_i}{{\displaystyle \underset{i=1}{\overset{n}{}}}{A}_i}$

$|di|=Y-y_i$

$I={\displaystyle \underset{i=1}{\overset{n}{}}}{I}_i+{\displaystyle \underset{i=1}{\overset{n}{}}}{A}_i**d_i^2$

Plase make the soultion clear. step by step