Answer:
answer of the first one
x+1>3 equal to x>2 by subtracting 1 from each side
so x>2 equal ]2,infinity[
answer of the second
-4<x<2 so the quantity of x is all the numbers from -4 to 2 but when it be greater than or smaller than without saying or equal we put the brackets opened so the result is ]-4,2[
but i can,t understand 3 and 4
