Radioactive decay: The amount remaining A, in grams, of a radioactive substance is a function of time t, measured in days since the experiment began. The equation of change for A is a. What is the...

Radioactive decay: The amount remaining A, in grams, of a radioactive substance is a function of time t, measured in days since the experiment began. The equation of change for A is

a. What is the exponential growth rate for A?

b. If initially there are 3 grams of the substance, find a formula for A.