20 1/2 - 6 5/8 simplified to the most

So you can convert the 1/2 to 4/8, to make it 20 4/8 - 6 5/8 and it makes 13 7/8

Aquadratic function is one of the form f(x)=ax2 + bx + c l, where a,b, and c are numbers with are not equal to zero.

This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.