How do you get the Math tutor for free? is it possible? I used to be able to, but now they want to charge me 30$ a month​

What is the volume of the sphere shown below with a radius of 3?

True or false look at the picture pls : /

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?