Can someone explain to me how to convert units between the coustomary and metric system

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then,the two had the same amount of money. how much money did each have originally?

The area of the map is the product of the length and width. write and expression for the area as the product of the two binomials do not multiply

The volume of the a sphere whoes diameter is 18 cm is cubic cm . if it's diameter were reduced by half, it's volume would be of its original volume