Could you tell me how to solve this 1.25×10^-2

Write each expression in exponential form and find its value. 3 x 3 x 3

Find the quotient. 50a2 – 98b2 -5a +7b

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?