What is the mean of 7 and 38

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

(05.03 mc) part a: explain why the x-coordinates of the points where the graphs of the equations y = 4x and y = 2x−2 intersect are the solutions of the equation 4x = 2x−2. (4 points) part b: make tables to find the solution to 4x = 2x−2. take the integer values of x between −3 and 3. (4 points) part c: how can you solve the equation 4x = 2x−2 graphically? (2 points)

What is the circumference of a circle with an area of 50.24 cm²?