Mrs. Doyle was planning a large fund-raiser. She wanted to know what kinds of music to play during the fund-raiser, She surveyed 200 people who were likely to come to the
fund-raiser. She found that Bo of them like to listen to country music. What percent of the
people she surveyed like country music?

Ill mark the brainliest if you me with the these three questions 7,8,9

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) = .

How do you determine if an ordered pair is a solution to a given equation?