Bookstore has 720 books in its inventory and 30% of those books are mystery novels. After a new shipment of history books arrives, mystery novels make up 20% of the inventory. How many history books arrived in the shipment?

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

How many ordered pairs of positive integers satisfy xy=32?

An unknown number x is at most 10. which graph best represents all the values of x? number line graph with closed circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the right. number line graph with open circle on 10 and shading to the left. number line graph with closed circle on 10 and shading to the left.