Explanation:
a > b means a is greater than b
a < b means a is less than b
a >= b means a is greater than or equal to b
a <= b means a is less than it equal to b
the symbols are chosen to represent this :
> larger to smaller
< smaller to larger.
it should be really simple now.
1a. greater than
1b. less than or equal to
1c. greater than or equal to
2. 25 is a solution to 1.c
30 >= n (25 is smaller than 30, or 30 is greater than 25)
3. 40 is not a solution to any of the 3 inequalities.
40 is smaller (and not greater) than 50.
40 is greater (and not less than or equal to) 20.
30 is not greater than or equal to 40.
4. 30 is a solution for 1.c
30 is greater than or equal to 30.