check the picture below.
so the playground is really just 3 rectangles and one triangle, now the triangle has a base of 8 and a height of 6. We can simply get the area of each figure, sum them up and that's the area of the playground.
the solution is in the above picture.
1,200 because 4x 3 is 12 and 40 x 30=1,200
It is A because the radius is 10 which means that if x=0 then y must equal 10. (0,5) would be inside of the circle. If this doesn't make sense graph the circle and the points and you'll see what I mean.
X/4-9=5
x/4=14
x=14/4
x=7/2
x=3.5