7(x+2)+34=55 (Find X in the following question)

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !

The graph below shows the line of best fit for data collected on the number of cell phones and cell phone cases sold at a local electronics store on twelve different days. number of cell phone cases sold 50 * 0 5 10 15 20 25 30 35 40 45 number of cell phones sold which of the following is the equation for the line of best fit? a. y = 0.8x b. y = 0.2x c. y=0.5x d. y = 0.25x