How many integers from 10 to 300 are squares of integers?
\(3^2 = 9<10\\ 18^2 = 324 > 300\\ \{x : x^2 \in [10,300]\} = \{4,5,\dots, 17\}\\ | \{4,5,\dots, 17\}| = 17-4+1 = 14\)
