Help me please [brainliest to best answer with explanation]

Me because some of question i don’t understand

What is the difference between regular convex and concave polygons

Graph g(x)=2cosx . use 3.14 for π . use the sine tool to graph the function. graph the function by plotting two points. the first point must be on the midline and closest to the origin. the second point must be a maximum or minimum value on the graph closest to the first point.