Answer:
530.66 square cm
Step-by-step explanation:
A=pi*r^2
A=pi*13^2
A=530.66
3x + y = 15
5x3y = 11
This is an example of a system of equations.
A system of equations is two or more equations that can be graphed, as the solution that satisfies both equations will be the point where the lines intersect on a graph.
Desmos is a graphing calculator, and thus it allows you to visualize this system.
Answer:

The population of city is 10 millions in year 2015 that is 5 years after 2010.
Step-by-step explanation:
We are given the following information in the question:
The population of a city, P, in millions, is a function of t.

where P is the population of city in millions and t is the number of years after 2010.
We have to interpret the meaning o the statement f(5) = 10.

Interpretation:
Comparing the relation we get,
It means that the population of city is 10 millions in year 2015 that is 5 years after 2010.