A committee must be formed with 4 teachers and 4 students. If there are 11 teachers to choose from, and 15 students, how many different ways could the committee be made?

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.