Answer:
-20 + 12
Step-by-step explanation:
Since they lost -20 yards, and gained 12, that means that -20 + 12 is the addition problem
The sum of it is -8 because if you add them, there will still be a negative number
lost 8 yards
expression -5-15+20=-8
Sum: Lost a total of 8 yards or -8
they lost a total of 20 yards than gains 12 yards so just add -20+12=-8
x = 6
AB = 11
BC = 22
Hope that helps :)
Check the picture below, keeping in mind that opposides sides and interior angles in a parallelogram are congruent.