Answer these math problems about rational and irrational numbers

Amovie streaming service charges it’s customers $15 a month. martina has $98 saved up. will she have any money left over if she pays for the maximum amount of months she can afford? explain.

How do you determine if an ordered pair is a solution to a given equation?

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.