Three friends were hunting in the taiga (swampy forest of Siberia). Two of them, while fording a small stream, got their cartridge cases wet. The three friends divided what good cartridges remained, equally. After each had fired 4 shots, the total cartridges remaining were equal to the number each had after the division. How many cartridges were divided?

Sera sells t-shirts at the beach. she believes the price of a t-shirt and the number of t-shirts sold are related. she has been experimenting with different prices for the t-shirts. she has collected a data set with five pairs of data; each consists of the price of a t-shirt and the number of shirts sold. the independent variable, which will go on the x-axis, is . the dependent variable, which will go on the y-axis, is the