Question

f + 0.3 < 1.7

Graph the solution on a number line

Answer 1

So,

F + 0.3 < 1.7

Subtract 0.3 from both sides.

F < 1.4

S = {F | F < 1.4}

Attached please find a number line with the solution.

Answer 2

so we can do anything to the equation as long as we do it to both sides
f+0.3<1.7
subtract 0.3 from both sides
f+0.3-0.3<1.7-0.3
f+0<1.4
f<1.4
so f is less than 1.4 not including 1.4
a number line would have a dot that is NOT filled in on 1.4 and then from that dot, it would go in the negative direction forever (normally to the left)

number line included