For this word problem: An isotope of sodium has a half-life of 20 hours. Suppose an initial sample of this isotope has mass 10 grams.The amount of the isotope (in grams) remaining aftert hours usingthe exponential decay function would look like what?

I'm not sure what it would look like. I know it's in the form of: amount(another amount)^t but I'm not sure how to put the amounts in for this work problem. Thanks!