Which of the functions graphed below could be defined by a cubic equation?

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

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?