The sum of 1 and 3 times a number is 22

a. x= 4

b. x= 6

c. x= 7

d. x= 9

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

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?