Answer
Highest degree of the polynomial $=4+5=9$
leading co-efficient of highest degree $=7$
Work Step by Step
Given: $4xy^3+7x^4y^5-3xy^4$
or, $7x^4y^5+4xy^3-3xy^4$
Highest degree of the polynomial $=4+5=9$
leading co-efficient of highest degree $=7$