Question
If $\mathrm{f}(\mathrm{x})=\left\{\begin{array}{ll}x^2+3, & x \leq 2 \\ 5 x+7, & x>2 \end{array}\right.$},then find$\mathrm{f}(\mathrm{C})$
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If $a=\frac{7}{243}, r=3$, find $t_6$
[6, 12]