Sky high school ordered two laser printers plus a supply of toner cartridge for them. each printer cost $675, and each cartridge cost $80. if the total cost was $2310, how many cartridges was ordered

If you could answer these your a life saver

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

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) = .