5points to whomever can me answer this question immediately ! the perimeter of a square is equal to four times the length of its side. write the direct variation equation that represents this situation. let y be the dependent variable and let x be the independent variable.

Iam so stuck. what is the worked out answer for this question?

Find an equation for the linear function which has slope -10 and x-intercept -7

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) = .