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.

Answer 1

D. 1.30 represents the 30% rate of weekly growth; 985 mold spores

Explanation:

thats the answer choice

Answer 2

1.30 represents the rate of growth of the mold spores. This decimal is a representation of the percentage growth, which would be 130%.

Since the function is written in terms of weeks, x will equal 4 to represent the amount of spores after 4 weeks. Plug the value into the function:

`345(1.30)^4 = \boxed{985.35}`

Rounded to the nearest ones value, there will be 985 mold spores after 4 weeks.