Find the area of a circle with a diameter of 12 cm

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.)

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs

Ineed to know how to write question one in mathematical terms