Which properties are best used prove a quadrilateral is a parallelogram?
a) Diagonals are congruent and perpendicular.
b)Diagonals are congruent.
c) Diagonals bisect and are perpendicular.
d) Diagonals bisect.

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

you should at least use a calculater

step-by-step explanation: