(Writing systems of Equations) Jenny bought supplies for a party. Three rolls of streamers and fifteen party hats costs $30.Later she bought two rolls of streamers and four party hats for 11$.Write a system of equations that can be used to determine the cost of each item.

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Suppose you just purchased a digital music player and have put 8 tracks on it. after listening to them you decide that you like 4 of the songs. with the random feature on your player, each of the 8 songs is played once in random order. find the probability that among the first two songs played (a) you like both of them. would this be unusual? (b) you like neither of them. (c) you like exactly one of them. (d) redo () if a song can be replayed before all 8 songs are played.

What is the area of the shaded sector?