15 is the answer eazy i never said 13
<span>Beth
is purchasing school supplies. She knows that the price for her pencil
case is $5. She only has $20 to spend. What is the most amount of money
she can spend on the remaining supplies?</span>
Step-by-step explanation:
1 + - 1 can also be written as 1 - 1.
1 + - 1
= 1 - 1
= 0
Hence proved.
are there options to the question or do you have to write it