Answer:
-33/28 or -1 5/28
Step-by-step explanation:
You would first find a common denominator. It would be 28. Your equation should look like this: -12/28 + -21/28. That equals -33/28 which simplifies to -1 5/28. I hope this is right and helps!
-33/28
-12/28 + -21/28
= -33/28
you can't simplify it so its -33/28
the answer is $153.69
the actual answer is 3/7
