ANSWER
[tex]2.29m[/tex]EXPLANATION
The combined height of the three people is 7 meters. This means that the sum of their heights is 7 meters.
Joey is 2.31 m tall and Eli is 2.4 m tall.
Let Keith's height be k.
Therefore, we have that the sum of their heights is:
[tex]2.31+2.4+k=7[/tex]Solve for k:
[tex]\begin{gathered} 4.71+k=7 \\ k=7-4.71 \\ k=2.29m \end{gathered}[/tex]hence, Keith is 2.29 meters tall.
