If someone could answer 10 and 11 for me that would be very

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 are the sotions to the quadratic equation 9x^2=4

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class