I need a little help with Algebra. Anybody willing to help?

Question

anonymous · Answer

I'll type the question here:
Part C: The average air pressure in another town is 29 inches, but the actual pressure is within 4 inches of the average. Write and solve an inequality to find the range of air pressure in this town.

anonymous · Answer

I would like you to help me work it out, not just tell me the answer.

anonymous · Answer

There is only one city concerned. Right ?

anonymous · Answer

Right.

anonymous · Answer

I know it says 'Part C', but it has no relation to the other two parts.

anonymous · Answer

OK. What is the minimum value of the pressure ?

anonymous · Answer

25 inches?

anonymous · Answer

Correct! What about maximum pressure ?

anonymous · Answer

It is 33 inches.

anonymous · Answer

Correct!

anonymous · Answer

See, what confuses me about this question is that I have to write and solve an inequality to find out the range of air pressure. All I am use to doing is writing an inequality that defines the range right off the bat. But I have to right and solve one that still defines the range in the end.

anonymous · Answer

Let the pressure be P. Then,  P-29 should be less than 4 or -4. Right ?