The difference between a two times number and 15 is 30

Answer 1

Hello, Mia,

[difference between a two times number and 15] = we'll rephrase this as (2x-15), where x is the "number.

Then we'll take "is 30" as make it "= 30."

So we wind up with (2x-15) = 30

2x -15 = 30

2x = 45

x = 22.5

Check to see if 22.5 works:

2(22.5) - 15 = ?

45 - 15 = 30 Checks OK