During his vacation, Dalyn rents a small boat from a rental service that charges a flat fee of $70 plus $10 per hour (including taxes). The total charge comes to$100 . Which equation can be used to calculate the number of hours ,x , that Dalyn rents the boat?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

What are “like terms”? why can we only add like terms?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)