For which values of A, B, and C will Ax + By = C be a vertical line through the point (7, 4)? A. A = 1, B = 0, C = 4
B. A = 0, B = 1, C = 4
C. A = 0, B = 1, C = 7
D. A = 1, B = 0, C = 7

What is the answer to |-2x-5|-|-4+8| and x=7

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

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) = .