Can someone me with questions 11 and 12v? ?

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

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.