How do i solve this ??

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Enter the number of complex zeros for the polynomial function in the box. f(x) = x+ + 5x² +6