What of the following is an expression?
A 7
B g + 2
C y
D 4 + k + 8
The expressions in the options are:
A) 7 (a constant)
B) g + 2 (an expression that involves a variable, g, and a constant, 2)
C) y (an expression that involves a variable, y)
D) 4 + k + 8 (an expression that involves variables, 4 and k, and constants, 4 and 8)
So, the expressions in options B, C, and D are all examples of expressions.