Which of the following statements are true?

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

The acceleration of an object due to gravity is 32 feet per second squared.what is acceleration due to gravity in inches per second squared?

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?