Please help me with this problem thank you

12x + 1 = 25 solve the following equation. then place the correct number in the box provided.

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?

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.