"twenty of the 100 digital video recorders (dvrs) in an inventory are known to be defective. what is the probability you randomly select an item that is not defective? "

The focus of a parabola is (-4,-5) and its directrix is y=-1 find the equation

Gia opened two savings accounts at two different banks. one account earns an annual 3.4% simple interest, and the other earns half as much. if she deposited $500 in each account, how much total interest will she have earned in 5 years? a. $34.00 b. $25.50 c. $51.00 d. $510.00

For each given situation, determine if the method of randomization is either appropriate or not appropriate