PLZZZZZZZZZZZZZ HELPPPPPPPP WILL MARK BRAINLIEST!!!!!!!!!!!!!!!!!!

Answer:
Volume of the rectanguler prism :
[tex] \sf v = \frac{21}{2} \: units {}^{2} \times \frac{8}{3} \: units[/tex]
[tex] \sf v = \frac{21}{2} \times \frac{8}{3} = \frac{168}{6}[/tex]
[tex] \sf v = \frac{168}{6} ( \frac{ \div 6}{ \div 6} = \frac{28}{1} )[/tex]
[tex] \sf volume = \boxed{ \bold{ \red{28 \: {units}^{3} }}}[/tex]
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Hope it helps!