Which symbol makes the statement true?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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?

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.