What number must be added to the sequence of 7,13 and 10 to get an average of 13

Ascatterplot is produced to compare the size of a school building to the number of students at that school who play an instrument. there are 12 data points, each representing a different school. the points are widely dispersed on the scatterplot without a pattern of grouping. which statement could be true

Which statement about the graph of y = 8(0.25)^2

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list