The width of a rectangle is 2x + 4 and the length of the rectangle is 6x + 12.
Determine the ratio of the width to the length.
Enter your answer as a simplified ratio a:b or as a fraction a/b.

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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) = .

A.s.a.! similarity in right triangles, refer to the figure to complete this proportionc/a = a/? a.) cb.) hc.) rd.) s