Alot of points must explain the answer in words

Find and simplify the difference of the golden ratio and its multiplicative inverse

Weak battery is considered to be a part of routine a. inspection b. wear and tear c. maintenance d. check

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?