A piece of glass with an initial temperature of 99°C is cooled at a rate of 3.5°C per minute. Concurrently, a piece of copper with an initial temperature of 0°C is heated at 2.5°C per minute.

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