Question

write a expression for:a number decreased by 39

Answer 1

Let the number be x.

If a number is decreased by another, it means that the number is subtracted from it. Therefore, if a number is decreased by a, we have the expression to be:

$x-a$

If the number is decreased by 39, this means that the expression becomes:

$x-39$

ANSWER:

$x-39$