Leon knows that his first four test grades were \( 92,91,85 \), and 95 . Use the formula \( \bar{x}=\frac{x_{1}+x_{2}+\ldots+x_{n}}{n} \) to find Leon's grade on the fifth test if his test average is 91.2 .

5. RESOLVA A OPERACAD : \( \frac{1}{3}+\frac{2}{5} \)

Perform the indicated operation and simplify the result. \( \frac{4}{15}+\frac{2}{15} \) \( \frac{4}{15}+\frac{2}{15}=\square \) (Type a simplified fraction.)

1. \( \begin{array}{l}54-(46+7) \\ 37-(24-8)\end{array} \)

Combine. Be sure to simplify your answer whenever possible. \( \frac{11}{18}-\frac{1}{18} \) \( \frac{11}{18}-\frac{1}{18}=\square \) (Type a fraction. Simplify your answer.)

\( \frac{12}{13}+\frac{1}{13}+\frac{10}{13}=\square \) (Type an integer or a fraction.)