Tony Jones borrowed $3,500 from Mountain Bank at a rate of 9%. The date of the loan was October 10. Tony hoped to repay the loan by February Assume the loan is based on ordinary interest. What will the interest cost be? How much will Tony repay on February 10? What would the payback be if exact interest was used?

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. 1.30 represents the number of mold spores marco had at the beginning of the study; 985 mold spores 1.30 represents the number of mold spores grown in a given week; 448 mold spores 1.30 represents the 30% rate of weekly growth; 345 mold spores 1.30 represents the 30% rate of weekly growth; 985 mold spores