Why are whole numbers subset of intergers, but not subset of natrual numbers

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

X+y=-4 x-y=2 use elimination with adding and subtraction

If angle ase measures 168 degrees, find the measure of angle dse. the figure mag not be drawn to scale