Don't remind me that im loosing points for this :D
H e l p Thank youuu

Answer:
[tex]\boxed{\sf volume = 320 \ ft^3}[/tex]
Explanation:
Volume of triangular prism = 1/2 × Base × Height × Length
Identify the following:
Find Volume:
[tex]Area \: of \: triangle = ½ × height× width \\ area = \frac{1}{2} \times 8 \times \frac{20}{3} \\ area = \frac{{ \cancel8} {}^{ \: \: 4} }{ \cancel2} \times \frac{20}{3} \\ area = \frac{80}{3} {ft}^{2} [/tex]
Now for volume :-
Volume = area of triangle (2D ) × length
[tex]volume = area \times length \\ vol = \frac{80}{3} \times 12 \\ vol = \frac{80}{ \cancel3} \times { \cancel{12}} {}^{ \: \: 4} \\ volume = 320 {ft}^{3} [/tex]