In a poll of travelers, 85% said that traveling by air makes them nervous, and 450 travelers said that it does not make them nervous. how many travelers were polled?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Your friend, taylor, missed class today and needs some identifying solutions to systems. explain to taylor how to find the solution(s) of any system using its graph.

The length of a rectangular board is 3 feet less than twice its width. a second rectangular board is such that each of its dimensions is the reciprocal of the corresponding dimensions of the first rectangular board. if the perimeter of the second board is one-fifth the perimeter of the first, what is the perimeter of the first rectangular board?