The row-echelon form of the augmented matrix of a system of equations is given. Find the solution of the system. [1 0 0 0| 9/4] [0 1 0 0| 3/5] [0 0 1 0| 2/3] [0 0 0 1| -9/5]

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.