Question 25 The volume of a rectangular solid (a box) can be found using the formula \( V=l \cdot w \cdot h \) where \( l \) is the length, \( w \) is the width, and \( h \) is the height. You measure a room to be 3.5 meters wide, 4.1 meters long, with ceilings 2.75 meters tall. What is the volume of the room? Give your answer as an exact decimal value.

2. PHPR is building a new playground. There are 2 different slides and 5 different swingsets to choose from. For the seesaw, there are 7 options. How many different playgrounds can they build? 3. Carly is making an ice cream sandwich. There are 2 types of sandwich cookies and 4 types of ice cream to choose from. For the candy mix-in, Carly has 2 options. Lastly, there are 3 possibilities for the sauce. How many different ice cream sandwiches can Carly make using exactly one of each item?

e) \( \frac{1}{2}-\frac{1}{4} \)

Write the fraction \( \frac{14}{21} \) in simplest form.

d) \( \frac{10}{13}+\frac{25}{39} \)

3) \( \frac{11}{15}+\frac{13}{20}-\frac{7}{30}= \)