Question

May I get some help? Thank you!​

Answer 1

81 ft cube get all of them and add after get all the answered then multiply them and you’ll get it which is 81

Answer 2

vol. of triangular prism = lbh/2

vol. of rectangular prism = 18 of vol. of triangular prism

18x = 18 + 14x

4x = 18

x=4.5 ft

so vol. of rectangular prism = 6 × 4 . 5 × 3 = 81 ftcube