John's bank account had $1,320 at the end of November. In December, he bought $645 worth of groceries and spent $225 on his mom's birthday present. Luckily, he earned $350 mowing lawns and $50
for good grades. How much money does John have at the end of December?

850 but im not sure lol

Step-by-step explanation:

645 + 225 = 870

1,320 - 870 = 450

450 + 350 = 800

800 + 50 = 850

-3/2

Step-by-step explanation:

5 1/2 - 7 can be done in a variety of ways.  One would be to convert 5 1/2 to 5.5:  then -7 + 5.5 = -1.5.

Or 5 1/2 could be converted to the improper fraction 11/2, from which 7 (converted to 14/2) would be subtracted:  11/2 - 14/2 = -3/2 = -1.5