Question

The sum of a number and 23 is 78....
I need an algebraic expression or equation.

Answer 1

the equation for this question will be, x+23=78. (By the way, x=55.)

Answer 2

Lets call our number
`x`. We know that we want a sum, which means addition, and we also know that the sum when we add together our number an 23 is equal to 78.

So we have: our number added to 23 is 78. Converting this to math symbols we get:
`x+23=78`