1) Use Green's theorem to calculate the following line integral over the positively oriented closed curve C, where is the boundary of the region enclosed by the curves y = sqr x + 2, y = x and x = 0.
I = integral(xy dx + xy dy)​

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Can someone me and do the problem plz so i can understand it more better

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.