PLEASE HELP!!
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What are the solutions to the system?

A) x = -6 and x = 3

B) x = -6 and x = -5.75

C) x = 3 and x = 5

D) x = -6 and x = -4

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

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.