Answer:
i believe its 12.55
Step-by-step explanation:
if you add both number, 12.90 and 12.20, then divide by 2.
you'll will gain the same result
Step-by-step explanatio
−10x−x+2
=−10x+−x+2
=(−10x+−x)+(2)
=−11x+2
5 girls : 15 boys
divide each by 5
1 girl: 3 boys
Choice C