help with this

Here is what to do first find the are of the bigger rectangular prism, 5*5*9=225 in³

After that, find the height of the triangular prism, 8-5=3

then find the volume of the triangular prism, ((3*4)/2)*5=30

Add those volumes together, 225+30=255 in³

 

 

255 in³

 

 

>=)