1. A bookshelf can hold no more than 80 pounds. It already holds 53 pounds of books. If $w$ represents the additional weight you can add, solve $53 + w \leq 80$. The maximum additional weight is ___.
2. A student needs to earn at least 120 points to pass a game level. Each round earns 8 points. Which inequality represents the number of rounds $r$ the student must play?
3. A school club wants to raise at least 240 dollars by selling cookies for 4 dollars each. If $c$ is the number of cookies sold, solve $4c \geq 240$. The minimum number of cookies they must sell is ___.
4. A diver descends at 15 meters per minute. To reach a depth of at least $-300$ meters, which inequality and solution correctly models the time $m$ in minutes?
5. Maria has saved 47 dollars and wants to have no more than 75 dollars total before buying a gift. If $d$ represents additional dollars she can save, solve $47 + d \leq 75$. The maximum additional amount she can save is ___.
6. Solve the inequality $x + 9 \leq 20$. The solution is $x \leq$ ___.
7. Solve the inequality $4x > 28$. The solution is $x >$ ___.
8. Solve the inequality $-5x \geq 30$. The solution is $x$ ___ $-6$.
9. When solving $-3x < 18$, what is the correct solution?
10. Which operation requires you to reverse the inequality symbol when solving an inequality?