Yes
15-w
Six less than w can be represented as: w-6
less than
w - 18
w-8
Six less than a number w squared is written algebraically as w2 - 6
That depends on the numerical value of W.
5-w=
w > -2
less than
15 + w expresses the sum of 15 and w
It is (6 + w) - 14