Is 5x2y plus 4x - 6 a binomial?

if the 5x2y means 5x2y + 4x - 6 then yes it is a binomial

but if the 5x2y means 5x * 2y + 4x - 6 then no it is not a binomial

a nomial means one degree. a binomial means something to the second power. a polynomial means anything that has a 3rd power and greater.