Every equivalent ratio to 16:24

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !