Carry out the calculations each person is performing and give the correct uncertainty. a) A truck operator estimates the distance from a land fill site to a job site to be 9.4 km . He adds 0.5 km for travel inside the job site and 0.3 km at the land fill site. What are the combined distances and uncertainties?

What is \(\frac { 4} { 20} \) simplified?

Calcola il valore dell'espressione. \( \left(\frac{1}{7}+\frac{2}{3}\right)-\left[\frac{1}{6}+\left(\frac{2}{3}-\frac{2}{4}\right)-\left(\frac{1}{6}+\frac{2}{4}\right)\right]+\frac{2}{7}-\frac{3}{2}+\left(\frac{1}{21}+\frac{3}{2}\right. \)

\( 2.1 .2 \sqrt { 50 } + \sqrt { 8 } - \sqrt { 32 } \)

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

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