<span>3. subtract 3
that's the next step</span>
First, you do 1/4 • 9 to find the total amount that is in the bag, which is 2 1/4 cups. Then, you do 2 1/4 - 5/8 to find out how much is left in the bag. There is 1 5/8 cups of trail mix left in the bag.
You make the rref of the matrix you will the the span