The weights (kg) of grade 6 students in a school are 30, 34, 32, 31, 34, 39, 36, 30, 32, 34, 38, 39, 35, 37, and 38. Find the range of the weights.

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