Answer:
Gabriella has $7 in change.
Step-by-step explanation:
First minus $13 from $20.
Then get $7 left over.
Finally $7 is your awnser.
What do you need help with? I'm looking for points mate..
A way to add fractions that always works is to multiply each numerator by the denominator of the other, then express the sum of products over the product of the denominators.

Here, you have
The sum is -1 1/12
32 64 128 are the answers