Yo if ur a math teacher, literally go suck straws if you know what i mean

Find the sum to the equation 3+6+9+

Measures of the angle of r, 31 s (x+4) t (3x+9)

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?