Use the following clues to find the secret number I am a 3-digit number.
All of my digits are odd.
I am less than 600.
I am greater than 400.
If you add my digits you get 15.
My last digit is 7
What am I?

How do i do this activity, is appreciated

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) = .

Plot a point at the y-intercept of the following function on the provided graph. 3y=-5x+7 20 points