In a different plan for area codes, the first digit could be any number from 3 through 8 , the second digit was either 1,2 , or 3 , and the third digit could be any number except 0 . With this plan, how many different area codes are possible?

3 A rectangular block has a volume of \( 40 \mathrm{dm}^{3} \). The base area is \( 20 \mathrm{dm}^{2} \). How tall is the rectangle?

TEST Quale delle seguenti frazioni genera un numero periodico misto: \( \begin{array}{llll}\text { A }-\frac{147}{6} & \frac{66}{18} & \text { C }-\frac{30}{45} & \text { D }-\frac{44}{24}\end{array} \)

\( 14 \Theta 17 ( \bmod 6 ) \)

5. Escribir \( >,<0= \) según corresponda: \( \begin{array}{llllll}\text { a. }-8 & 40 & \text { b. } 8 & -3 & \text { c. }-2 & -12 \\ \text { 6. Realizar las siguientes operaciones: } & & \text { d. } 100 & -1000\end{array} \) \( \begin{array}{llllll}\text { a. } 512+22 & \text { b. } 150-25 & \text { C. }(-300)+(-976) & \text { d. }(-80)+(-120) & \text { e. }(-48)+9 & \text { f. }(-98)+27 \\ \text { g. }(-83)+29 & \text { h. }(-20)+(+20) & \text { i. } 7+5+(-4)+(-24) & \text { j. }(-32)+23+(-11) & \text { k. } 12+(-4)+(-10)+(-9)\end{array} \)

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