..Find an approximate equation of the exponential curve that contains the given pair of points. Round the value of b to two decimal places.

(0, 256) and (7, 23)

my work:

Mr F says: Correct.

which is Mr F says: Time to get a new calculator. The seventh root of 23/256 cannot possibly be greater than 1! I get 0.71, correct to two decimal places.

Thus,

Is this the right answer?