If degree of the expression
is 10 the value of m is 4
What is expression?
An expression or algebraic expression is any mathematical statement which consists of numbers, variables and an arithmetic operation between them. For example, 4m + 5 is an expression where 4m and 5 are the terms and m is the variable of the given expression separated by the arithmetic sign +.
Given that

Then we need to add the degree up and equate to 10 as
degree of x + degree of y + degree of z= 10
5 + m + 1 = 10
m + 6 = 10
m = 10 - 6
m = 4