50 points please help i need it so bad

Julia measured the high temperature in her town for one week. using the chart above, find the mean absolute deviation for the high temperatures. round your answer to the nearest tenth. be sure to show your work for finding: the mean of the set of data the distance of each number from the mean the mean absolute deviation

What number should be added to both sides of the equation to complete this square? x^2-10x=7

How is working backward similar to solving an equation?