Over a ten year period, the population of one city changed from 3.2 million to 2.8 million. what was the percent change in the city's population?

Ineed in figuring out this problem.

The graph shows the charges for a health club in a month. make a function table for the input-output values. writes an equation that can be used to find the total charge y for the number of x classes

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels