Find the volume of the composite figures please. There are 4 but you don't have to do all of them im grateful for whatever help i can get :-)

4. (4*5*5)+(9*5*4)= 280 yd cubed

5. (11*6*4)+(7*3*1.5)= 295.5 ft cubed

6. (384*5)+(11*4*11)= 2404 yd cubed

7. 42+18= 60 mm cubed

i beleive that it was john rolfe