For which set of data is the mean 8.1? 6.6, 7.5, 8.1, 9.2, 9.8 8.1, 8.1, 8.7, 8.8, 9.9 4.2, 6.7, 8.1, 5.5, 9.1 8.5, 8.0, 8.0, 9.0, 7.0

step-by-step explanation:

in the absence of parentheses, i will have to make some assumptions:   i interpret your (3x+5/y^6)(4y^3/5)​ to mean:

3x + 5     4y^(3/5)       (3x + 5)(4)

* =

    y^6             1               y^(6-3/5)

if this is not what you expected, repost your question using parentheses to indicate whether you meant

4y^3

    or   4y^(3/5)

    5