Pls help! I need to turn this in ASAP:) would much appreciate it

What is the slope of the equation y =

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?

Aright cylinder has a diameter of 8 m and a height of 6m. what is the volume of the cylinder