Use a graphing utility to demonstrate that f(k) = r. pls helpp.​

Combine like terms to make a simpler expression 3z+z

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.