The formula is 2-k. The answer depends on the value of k.
998
k = 2 and 2 < 12
87 K + 100 K = 187 K The real answer is 2 K less than that. Estimate 185 K.
If you want to say "Nine is less than a number k," you would write 9<K. If you're asking for an equation, e.g. "Nine less than a number k is equal to that number divided by three," you would write k - 9.
k - 5
k - 15
ok
k=22
k - 6
k-7
3 - k
It is simply: k-4