Anthony's Netflix payment decreases $5 each year. Which expressions represent the total change in his payment after 4 years? A
−5×−4
B
−(4×5)
C
−5×4
D
5−5−5−5
E
−20

Acircle has a circumference of 28.36 units what is the diameter of the circle

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

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) = .