I have 2 questions and i have their answers but i m unable to understand them.

Q-1) x=0 is the solution of the inequality?

Q-2) Temperatures = 4, 1, 0, -2, -1, -3, 1, -2, 3, -1

How many of these temperatures are with in2.5 degree C of 1 degree C?

Answer: -1, -1, 0, 1,1, 3