The viewing angle to a vertical screen is 18 degrees and the distances between the viewing point P and the top and the top and bottom of the screen are 25m and 23m, respectively. Find the height of the screen (x m), correct to the nearest centimetre

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?