On a multiple choice test there are 5 answers but only 1 correct one. if you were to guess on every question on a 20 question test, what is the probability that you will get at least 4 questions

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Which of the following equations is equivalent to x/3-6/x=1