On three consecutive passes a football team gains 7 yards, loses 34 yards and gains 24 yards. What number represents the total net yardage?

For this would I just add 7+34+24 or is there a formula I should use?

the second pass resulted in a loss, so

7 - 34 +24 = ...

You have 3 gains

So is that what the net yardage would be gains?

Yes.

To find the total net yardage, you would need to add the yardages gained and subtract the yardages lost. In this case, you would calculate:

Total Net Yardage = (Gained Yardage 1 + Gained Yardage 2 + Gained Yardage 3) - (Lost Yardage)

Total Net Yardage = (7 + 24) - 34

Total Net Yardage = 31 - 34

Total Net Yardage = -3

Therefore, the total net yardage is -3 yards.