If bert had 3 cents more he would have twice as much as georgia. if he had 4 cents less, he would have the same amount. how many cents does bert have?

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents