How does the sum 4x to the 3rd power 5x + 6 demonstrate the closure of polynomials under addition

The sum of two numbers is 12 and their difference is 18 what are the two numbers

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?

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?