Find the first, fourth, and eighth terms of the sequence. f(x)=-5*3^-1

Classify the following triangle check all that apply

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

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?