PLEASE HELP I DONT KNOW HOW TO DO THIS

In the diagram below what is the approximate length of the minor arc ab

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?

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs