Explain why a rectangle is a convex quadrilateral

Which system of linear inequalites is represented by the graph?

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)

With finding limits of multi variable !