Sharon brought fabric to make costumes.
12 yards of blue fabric cost $8.
4 1/2 yards of green fabric cost $3.
9 yards of red fabric cost $5.
1 1/2 yards of yellow fabric cost $1
which color fabric has a different unit cost than the others?
a. blue
b. green
c. red
d. yellow

Red fabric has a different unit cost to the others

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.