The shape is composed of squares and quarter circles. Select all the expression that represent its perimeter. A). 42 + 14π B). 7+7+7+7+7+7+3.5π+3.5π+3.5π+3.5π C). 91+14π D).147+49π E). 7+7+7+7+7+7+7+7+7+7

Complete the solution of the equation. find the value of y when x equals to 1 9x-5y=29

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) = .

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.