Define a variable and write in solving any quality to solve the word problem A farmer is fencing a field that had a width of 40 feet. He has 200 feet of fencing that he can use. At most how many feet can the length of the field be?

Ithink it's b sorry if i'm wrong

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.