Your answer would be A. 122° and 58° because both angles have to equal 180°
the x s are the independent variable so any direct change to them is changing the independent. like the second one has -5 on the x
The formula of an area of a circle:

r - a radius
We have r = 14m. Substitute:

If you want an approximate area, you can accept 
Then:

Answer:
It could be to: collect data from a sample of every twentieth student who arrives at school one day