Find the missing value of 3, 5, 7, 9, mean =7

Find the difference (8ab+a+2) - (3ab+6)

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?

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.