18.
7. a baker's dozen (13) of cookies is on sale
for $4.94. what is the cost of an individual
cookie?
ya

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

What is the prime factorization of 23 ?me with this question

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) = .