What is the value of x in the figure shown below?

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?

Express -5 2/5 as an improper fraction.

Find the rate of change for the situation.you run 7 miles in one hour and 21 miles in three hours.