A 20 tooth wheel A meshes with another 40 tooth 8 wheel. I attached another 10-tooth C-wheel to the Bhay axle that meshes with another 30-tooth D-wheel. If wheel A is 180 turns per minute, how many turns will wheel D go?

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?