Find the degree of the following terms.
5x²

Add and find the degree of the following expressions.
(9x + 3y) and (10x − 9y)

LEADERS is a WhatsApp group with 256 members. Every one of its member is an admin for their own WhatsApp group with 256 distinct members. When a message is posted in LEADERS and everybody forwards the same to their own group, then how many members in total will receive that message?

Find the value of w, given that x = 3 , y = 4 , z = −2 and w = x² − y² + z² − xyz .

The two adjacent sides of a rectangle are 2x² − 5xy + 3z² and 4xy − x² − z² . Find the perimeter and the degree of the expression.