Can some one help me solve this i did not understand it at all.

The jurassic zoo charges $14 for each adult admission and $5 for each child. the total bill for 77 people from a school trip was $565. how many adults and how many children went to the zoo? i

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price