The awnser is :
6y^3 + 17y^2 + 22y + 15
Hope it helps
I don't know what posts are but i'm assuming you would subtract 21 from 17 and get 4.
Answer:

Step-by-step explanation:

Answer:
168.24784 m²
Step-by-step explanation:
Area of the square:
28 x 28=784 sq. m.
Area of the circle:
π(r²)=π(14)²=196π
=615.75216
Area not covered by the sprinkler:
784-615.75216=168.24784 m²