These questions are very difficult... can someone explain them

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

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?

In the diagram of circle o, what is the measure of zabc?