Answer:
19 and 8
Step-by-step explanation:
19+8=27
19-8=11
16
4+6+7+7+11+12+15+18+20= 100
divide by the number of values we have. we have 9 values
100/9=11.1111111111
I hope this helped
9+10=19
....................
Triangle I think........
the answer is : 1.7777
