Five times the sum of a number and 4 is -15

Which of the following are accepted without proof in a logical system? check all that apply.

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.

Astraight water slide is 175 feet above ground and is 200 feet long. what is the angle of depression to the bottom of the slide?