Remember that
If an ordered pair is a solution to an inequality, then the ordered pair must satisfy the inequality
so
we have
y ≥0.5x+1.8
Verify each ordered pair
N 1 -----> (4.5,3)
x=4.5, y=3
substitute
3 ≥0.5(4.5)+1.8
3 ≥ 4.05 ------> is not true
that means ----> the ordered pair is not a solution
N 2 ----> (2.5,2)
2 ≥ 0.5(2.5)+1.8
2 ≥ 3.05 ------> is not true
that means ----> the ordered pair is not a solution
N 3 -----> (3,2.5)
2.5 ≥ 0.5(3)+1.8
2.5 ≥ 3.3 -----> is not true
that means ----> the ordered pair is not a solution
N 4 ----> (4,4.5)
4.5 ≥ 0.5(4)+1.8
4.5 ≥ 3.8 -----> is true
the ordered pair is a solution
therefore
the answer is the last option