If f ( 0 ) = 10 {\displaystyle \displaystyle f(0)=10} and f ′ ( x ) ≥ 3 {\displaystyle f'(x)\geq 3} for 0 ≤ x ≤ 4 {\displaystyle 0\leq x\leq 4} , what is the least f ( 4 ) {\displaystyle \displaystyle f(4)} could possibly be?