Scientists are studying a sample of radioactive material. The amount left, in grams, after t days can be modeled by the function N(t)=a(b)t, where a and b are constants. This table shows two values of the function.
t N(t)
1 58.5
2 52.65
Find an expression for N(t). Write your answer in the form N(t)=a(b)t, where a and b are integers or decimals. Do not round.
N(t)=