If cos theta = 0.8, find 1 / sin (pi/2 - theta)

What is the volume of the sphere shown below with a radius of 3?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be