I need number 4 and 7 please

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

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Julian wrote the following numeric pattern on the board3,10,17,24,31,38.what numbers of julian's pattern are compound numbers.