When should you use dot plots and why?

Consider the function f(x)=-5x+3 what is f(-2)

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.)

What is the length and width of a 84.5 square foot rug? will mark