what does it mean to solve for a variable when the solution is not a
number?

It might help you if you knew what  variable was.

A variable can be (x) or (y) or anything really it just a letter the represents a number.

In this case, when it says solve for a variable it means find what the variable equals. For example:

4x + 18 = 2

here you need to find the value of X.

x = -5

X equals negative 5 because you multiply the variable to the number:

4 x -5 = -20

-20 + 18 = 2

making the

4(-5) + 18 = 2

x = -5

(hope this helps)

70,000 + 6,000 + 800 + 30

step-by-step explanation:

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.