Let, number of pounds of trout is x and their price is C.
For, x < 10 :
Price per pound is 30 .
C = 30x + 2 ....1 )
For, x ≥ 10 :
Price per pound is 24 .
C = 24x + 6 ....2 )
Therefore, total cost is :
[tex]C =\$ \left \{ {{30x+2 \ \ \ \ x<10} \atop {24x +6 \ \ \ \ x \ge 10}} \right.[/tex]
Hence, this is the required solution.