Leah is buying curtains for her bathroom window. she wants the curtains to hang from the top of the window to the floor. the window is 4 feet high. the bottom of the window is 2 1/2 feet above the floor. how many inches long should leah's curtains be.

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?