You are standing 15 feet away from your friend's apartment building and look to see your friend at an angle of elevation of 72º. How high up is your friend?

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

The distributive property allows you to say that 3(x − 1) = 3x −