Bob's skate shop had a profit of $3,563 during the month of august. the company models its profit using p=x^2+10x-12 where x is the number of skateboards the company sells. how many skateboards did the company sell during the month of august?

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?