A rectangle has a height to width ratio of 3 : 4.5. Choose the rectangle that could be a scaled version of this rectangle.
A. rectangle measuring 10 units by 14 units
B. rectangle measuring 6 units by 9 units
C. rectangle measuring 6 units by 12 units
D. A rectangle measuring 7 units by 9 units

Ineed me i stuck and i don’t want to get it wrong

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) = .

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?