Achain 5 links long is joined to a chain 7 links long. how many links long is the resulting chain?

Asphere has a diameter of 10 in. what is the volume of the sphere?

Ined this is due tomorrow and i dont know the answer can you find all the exponents

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?