What is the difference? 86,700,000−3.45×10^7

a. 5.22
b. 5.22 x 10^6
c. 5.22 x 10^7
d. 5.22 x 10^8

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

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Which of the following represents the length of a diagonal of this trapezoid?