Alexander says that 3x + 4y is equivalent to (3) (4) + xy because of any order, any grouping. Is he correct why or why not

Alexander is incorrect because the expressions are not equivalent.

Step-by-step explanation:

If the expression is evaluated for any value of x, y; the result will not be same.

For instance, let assume x = 1 and y = 2

3x + 4y = 3 + 4 = 7

(3) (4) + xy = (3) (4) + (1 * 2) = 12 + 2 = 14

So, the expressions are not the same and Alexander is incorrect.