Help with 17,19,21,and 23

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?