Can someone me with this? i don't really understand it and i would really appreciate if you can show me step by step how to solve this; i have other similar ones to this one but i just need one to be done and explained so i can understand how to do the others on my own.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11

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.