Which prefix is used for a quintillion?

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

Write 5 in the form of a/b using integers to show it as a rational number

Arectangle has a length of 6cm by 8cm what is the length of a diagonal of the rectangle