Whats the rest of the question
Me to I was doing the work but just lost it I will try again
12/21 in its simplest form is 4/7.
To find this out we need to divide the numerator and denominator by the GCF of 12 and 21 which is 3.
12/21
12 ÷ 3 = 4
21 ÷ 3 = 7
4/7
12/21 in its simplest form is 4/7.
12/21 = 4/7
just like the previous one, we sum the sides to get the perimeter.

Step-by-step explanation:
pop goes the weasel is quadratic formula song