Expression any single number or variable, or combination of operations (-, +, ×, ÷) involving numbers and variables
eg: 5n, 8+, x+1, 2y-7
Value a know or calculated amount
Constant a number that does not change and it increase or decrease the value of an expression.
Numerical Coefficient a number that multiples the variable.
the 2 is the numerical coefficient and the t is the variable
A group of students talking, 2 friends leave the group. Write an expression for the number of students in the group after the 2 people leave.
the answers is either: g-2 or s-2
The variable is g is for group and s for students. Constant is the minus (sign) because it`s decreasing.
Hope you understand it!
Here is the picture!!