I NEED THE ANSWER ASAP Determine one of the best possible numbers of positive real zeros, negative real zeros, and imaginary zeros for f(x)=2x^7-3x^6+5x^4+x^3-6x^2+1 by using Descartes' Rule of Signs.
a.)1,1,5,7
b.)2,2,3,7
c.)2,3,2,7
d.)1,3,3,7

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