Cylinder A is similar to cylinder B. Cylinder A has a radius of 7 cm. Cylinder B has a diameter of 33.6 cm. Find the height of Cylinder B if cylinder A has a height of 15 cm.

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?