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 .

11. Arnaldo tinha 100 reais e gastou \( \frac{3}{7} \) do que tinha. Com quantos reais ficou Arnaldo? a) 40 b) 50 c) 60 d) 70 e) 80

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.)

Find the \( 12^{\text {th }} \) term of the arithmetic sequence whose common difference is \( d=8 \) and whose first term is \( a_{1}=5 \).

B) \( 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2 \cdot 2= \)

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