Pls answer i will mark you as a brilliant answer

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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?

Abcd is a square. what is the measure of angle bac