Find the mean of 2,1,9,7,7,4 graphically

Lindsay used two points, (x, y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

Find the value of the variable and the length of each chord for #5 and #6.