Find sinx given cos2x=5/9

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.