A 4% salt solution is mixed with an 11% salt solution to obtain 35 gallons of 7% salt solution? how many gallons of the 4% salt solution are needed? How many gallons of the 11% salt solution are needed?

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

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.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?