A variable is a symbol
So in this problem the variable is x.
An expression means
Every
Mathematical
Stuffs
:dddd
so 6+x is an expression
A constant is every number without variable
6 is a constant in this problem.
A formula is an exprassion WITH equation.
For example 6 +x= 10 is a formula coz it has an equation and everything is certain (even the x is)
So the correct answer is B
Hope it helps!!!
#MissionExam001