Question

How do you evaluate the expression when x = 2, y = 7, z = 4 for xy?

Answer 1

The expression `xy` is equal to `14` when `x=2` and `y=7`

Explanation:

`xy` means `x xx y`

Replacing `x` with `2` and `y` with `7`
we get
`xy = 2 xx7 = 14`

(the value of `z` is irrelevant).