SOMEONE THAT KNOWS PRE CALCULUS I NEED HELP ON THESE QUESTIONS (Please don't leave stupid answers to take my points this is my third time asking for help on these and everyone just takes my points so please)

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

What is the distance between a and b? round your answer to the nearest tenth. a coordinate plane is shown. point a is located at negative 1, 5, and point b is located at 4, 1. a line segment connects the two points.

Afunction, f(x), represents the height of a plant x months after being planted. students measure and record the height on a monthly basis. select the appropriate domain for this situation. a. the set of all positive real numbers b. the set of all integers oc. the set of all positive integers od. the set of all real numbers reset next