You and three friends are planning a trip. You want to keep the cost below $80 per person. Write and solve an inequality that represents the total cost of the trip.

For the equations below which statement is true ? -2x=14 6x=-42

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.

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.