What is the formula to find the radius if you were given the diameter

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

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 acceleration of an object due to gravity is 32 feet per second squared.what is acceleration due to gravity in inches per second squared?