Please help me with these problems. I really need help.

A farmer has 600 meters of fencing and wants to make two side-by-side rectangular enclosures as shown in the diagram. What is the maximum area that he can enclose? 23. Make an appropriate substitution and use it to solve the system. 3x1/2 + 14/5 =11 (271/2 + 3)/ 415 = 19 25. Complete the square and find the vertex of the parabola. Find the quotient and remainder of N'-4x- +1+6 I-2 y=x +10x+7 Vertex