A set of 3 pens costs $1.68 . At that unit price, how much would 10 pens cost?

5.60

Step-by-step explanation:

1.68/3

=0.56

0.56x10

=5.60

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