Which would justify statement 4 ?

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

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse