Write an equation and then use it to solve: Sasha gives half of her books to the local library and keeps the other half. Her best friend gives her 3 more books. She now has 57 books. How many books did she have to begin with?

The graph below shows the price of different numbers of mats at a store: a graph is shown. the values on the x axis are 0, 2, 4, 6, 8, 10. the values on the y axis are 0, 21, 42, 63, 84, and 105. points are shown on ordered pairs 0, 0 and 2, 21 and 4, 42 and 6, 63 and 8, 84. these points are connected by a line. the label on the x axis is number of mats. the title on the y axis is price in dollars. which equation can be used to determine p, the cost of b mats?

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x