Find the missing side length and show your work to be marked brainliest! (lots of points)

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

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x