Question

Marco is studying a type of mold that grows at a fast rate. He created the function f(x) = 345(1.30)x to model the number of mold spores per week. What does the 1.30 represent? How many mold spores are there after 4 weeks? Round your answer to the nearest whole number.

(A) 1.30 represents the number of mold spores Marco had at the beginning of the study; 985 mold spores
(B) 1.30 represents the 30% rate of weekly growth; 985 mold spores
(C) 1.30 represents the number of mold spores grown in a given week; 448 mold spores.