Un plop a crescut intre doua blocuri B1 si B2 Inaltimea blocului B1 este de 10m, iar inaltimea blocului B2 este de 15m. varful plopului, O, apartine dreptelor CD si EF. Atunci, inaltimea plopului este egala cu?

Ineed to learn how to solve this problem

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.

For which pair of functions is (gof)(a)=|a|-2?