2) Find the Volume of the solid whose base is bounded by the circle x2+y2=4with squareCross sections taken perpendicular to the x-axis.

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

Which one ? is the answer and how to find this answer

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days