159383

First we tried to find the value of the shapes, so we looked at the rows that only had one different shape and the rest were the same, so we realised while looking at the rows that the hexagon was the same value as the triangle +1, and that the square was a hexagon +1. So we used the guess ,check, and improve strategy to find out the value of the consecutive shapes till we got the answer.

circle =4
triangle =6
hexagon=7
square = 8

And then we added them together and then the answer is 21.

Elena, Iris
-Peak School