Arjun made a trip to the ferry office and back. The trip there took two hours and the trip back took five hours. He averaged 48 mph faster on the trip there than on the
return trip. What was Arjun's average speed on the outbound trip?
E
His speed was
mph

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

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) = .

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?