A scale drawing of a car is presented in the following three scales. Order the scale drawings from the smallest to the largest. 1 inch to 1 foot
1 inch to 1 meter
1 inch to 1 yard

Evaluate the following expression 1/3^2

The square root of 9x plus 7 plus the square rot of 2x equall to 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) = .