Question

This is something about absolute value but i have no idea how to do it

Answer 1

You're looking for an inequality of the form
`|t-b|\le a`, or
`-a\le t-b\le a`, or
`b-a\le t\le b+a`.

Start with

`350^\circ\le t\le400^\circ`

Notice that 375º is the midpoint of this interval of temperatures. If we subtract all sides by 375º, then we get

`-25^\circ\le t-375^\circ\le25^\circ`

so we can set
`a=25^\circ` and
`b=375^\circ`, and we can rewrite this inequality in terms of absolute values as

`|t-375^\circ|\le25^\circ`