PLEASE HELP FIND (FACTOR THE COMMON FACTOR OUT OF REACH EXPRESSION) WILL GIVE 100 POINTS!!!+ BRAINLIEST!

What are correct trigonometric ratios that could be used to determine the length of ln

Can someone pls ! pls answer all. no explanation needed..

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?