2b^2 + 81/2 b + 4
basically 2b^2 + 16b + 49/2 b + 4
= (2b^2) + 16b+49/2b) + (4)
= 2b^2 + 81/2 b + 4
The answer would be 680 because 20% of 850 is 170 so 850-170=680.
Answer:
here are a few that are equivalent
8:6
28:21
48:36
68:51
Mmm looks like a test. I don't know if we should be answering this.