How can you use the concept of proportional relationship to decide whether the student is correct?

John bought 5 lemons and used 2 of them for a salad how much did he use for.a salad . he used % of the lemons.

Find the vertex of the function given below y=x^2-6x+1

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?