4. Реши задачи. а) Для изготовления орнамента купили 5 кусков тесьмы по 9 м ещё 20 м. Сколько всего метров тесьмы купили?

c) \( 3,23-3,23= \)

A company is going to have a dinner party in a restaurant for its top employees. The restaurant is going to charge them \( \$ 280 \) for the use of their function room, plus \( \$ 40 \) per dinner. The company has a budget of no more than \( \$ 1500 \). What is the greatest number of people they can invite to this dinner? o 30.5 people o 31 people o 30 people o 37 people

1) \( \left[\begin{array}{l}3 \\ 4\end{array}\right]-\left[\begin{array}{l}-5 \\ -1\end{array}\right] \)

1. \( \frac{1}{3} \times \frac{2}{5} \)

Write each decimal as a percent. \( \begin{array}{l}\text { 10. } 3.9 \\ \text { 11. } 81\end{array} \) \( \begin{array}{ll}\text { 18. } 6.75 & \text { 14. } 2.81 \\ \text { 16. } 0.0046 & \text { 17. } 0.0069\end{array} \) Write each number as a percent.