Sin a/2 if cos a = -17/8 ( assume sin a/2 is positive) Use half angle identities to find the exact value

Please please help

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?

What is the measure of angle tvu shown in the diagram below

Graph y = -|x| + 2. click on the graph until the correct one appears.