Find the polynomial im descending power of x representing the area of the shaded region

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?

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5