The points (x, 3) and (-1, -4) lie on the same line. If the slope of the line is 1, what is the value of x?
A-3
B 1
C 6
D-6

Three times the sum of a number and seven is negative thirty-six. what is the number?

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) = .

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take