Answer all 4 100 points will mark as brainliest out the name beside the !

Rewrite the following without an exponent. (5/8)-1

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

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