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Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1