The height h of a cylinder x of a given material varies directly as the mass and inversely as the square of it's radius r, the height of X is 12cm, it is required to make another cylinder Y of the same material. If the mass of Y is 1/4times the mass of X and it's radius 0.4 times of x, calculate the height of Y

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?