Part a
we have the inequality
The solution in interval notation is equal to
(-infinite, 4]
because the number 4 is included, is a closed interval
Part b
we have the values of x [0,1,2,3,4,5,6,7,8]
the solutions for the given inequality are
[0,1,2,3,4]
we have
x< 0
the solution is the interval
(-infinite, 0)
In a number line, the solution is the shaded area at the left of x=0 (open circle)
x< 3
the solution is the interval
(-infinite, 3)
In a number line, the solution is the shaded area at the left of x=3 (open circle)