a) \( \left(\frac{2}{5}-\frac{1}{7}\right):\left(\frac{1}{3}+\frac{21}{2}\right) \)

2. Ordena de menor a mayor: \( \begin{array}{lcccr}\text { a) } 5,83 & 5,51 & 5,09 & 5,511 & 5,47 \\ \text { b) } 0,1 & 0,09 & 0,099 & 0,12 & 0,029 \\ \text { c) } 0,5 & -0,8 & -0,2 & 1,03 & -1,1\end{array} \)

Michelle's Sports sells golf tees in packs of 9. Meanwhile, Jen's Gear sells them in packs of 8 . If both shops sold the same number of golf tees this week, what is the smallest number of tees each could have sold?

25. Un ciclista que viaja a una velocidad de \( 12 \frac{\mathrm{~km}}{\mathrm{~h}} \) recorre una distancia en 40 minutos. ¿Qué distancia recorrerá en el mismo tiempo el ciclista, si su velocidad es de \( 18 \frac{\mathrm{~km}}{\mathrm{~h}} \) ? \( \begin{array}{llll}\text { a) } 8 \mathrm{~km} & \text { b) } 10 \mathrm{~km} & \text { c) } 12 \mathrm{~km} & \text { d) } 16 \mathrm{~km}\end{array} \)

Rose has two pieces of thread, one 32 feet long and the other 16 feet long. For a sewing project, she needs to cut them up to produce many pieces of thread that are all of the same length, with no thread left over. What is the greatest length, in feet, that she can make them?

Type the answer as a fraction. Ginny divided the cake into 12 pieces She gave 4 pieces to Sammy What fraction of the cake did she have left