Please, I need help with some kind of explanation. Find the exact value of the following:

Cos(tan^-1(4/3) + cos^-1(-√5/5))

G(x) = 2 sin(2x - π) + 4. using complete sentences, explain how to find the minimum value for the function.

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling