Every cereal box has a gift inside, but you cannot tell from the outside what the gift is. The store manager assures you that 21 of the 58 boxes on the shelf have the secret decoder ring. The other 37 boxes on the shelf have a different gift inside. If you randomly select two boxes of cereal from the shelf to purchase, what is the probability that BOTH of them have the secret decoder ring?

How is the number of vertices for a prism related to the name of the prism

Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e. g. 98.76543).

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