The ratio of the loudness of Lalas earphones to the loudness of Polina's earphones to the loudness of Goffy's earphones is 6:5:3, respectively. If Polina's earphones have a loudness of 90 decibels, find the total loudness of all three earphones?

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

What are “like terms”? why can we only add like terms?

Ineed i been stuck on this question since yesterday