HWLP PLEASE I DONT KNOW HOW TO DO It

[tex]\textrm {Volume of rectangular pyramid :}[/tex]
[tex]\mathrm {Volume = \frac{1}{3} \times length \times width \times height}[/tex]
[tex]\mathrm {Volume = \frac{1}{3} \times 9 \times 8 \times 9}[/tex]
[tex]\mathrm {Volume = 3 \times 72}[/tex]
[tex]\mathrm {Volume = 216 cm^{3}}[/tex]
[tex]\textrm {Volume of rectangular prism :}[/tex]
[tex]\mathrm {Volume = length \times width \times height}[/tex]
[tex]\mathrm {Volume = 9 \times 8 \times 7}[/tex]
[tex]\mathrm {Volume = 72 \times 7}[/tex]
[tex]\mathrm {Volume = 504 cm^{3}}[/tex]
[tex]\textrm {Total volume of composite figure :}[/tex]
[tex]\textrm {Volume of pyramid + volume of prism}[/tex]
[tex]\mathrm {216cm^{3} + 504cm^{3}}[/tex]
[tex]\mathrm {720cm^{3}}[/tex]