we know that
Karen batting average was [tex] 0.444 [/tex]
[tex] 0.444 [/tex] is equal to [tex] \frac{44.4}{100} =44.4\% [/tex]
so
by proportion
[tex] \frac{44.4}{100} =\frac{x}{45} \\\\ 100*x= 45*44.4\\\\ x=\frac{45*44.4}{100} [/tex]
[tex] x=19.98\ hits [/tex]
therefore
the answer is
[tex] 20\ hits [/tex]