Asalesman needed to sell a four wheeler. he priced it at 3500 the first day it was on the market. the second day he reduced the price by 15%. what was the price of the four wheeler after the reduction

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .

Which geometric principle is used to justify the construction below?

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?