Which expression gives the determinant of the matrix

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

How is working backward similar to solving an equation?

Pls never taught i’m really confused and i rlly need