A football team lost 19 yards on each of their first three plays. What was their overall change in yardage?

Let's say the set of downs starts at the 20 yard line (maybe the kicking team kicked deep, the receiving team took a knee and so play starts at the 20).

Ok - we're at the 20. First down - they advance 5 yards. So we're now at the 25. We can write that mathematically as:

20

+

5

=

25

So the second play they get sacked deep and lose 6 yards. So we subtract 6:

25

−

6

=

19

So what's the change in yardage for the 2 plays? We are on the 19 and started at the 20, so we can write:

19

−

20

=

−

1

and this makes sense because we know we advanced 5 and fell back 6:

+

5

−

6

=

−

1

Step-by-step explanation:

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12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12