Whats the solution for 7x−y=7 x+2y=6

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

How do you find principle and simple interest

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.