I’m not sure if my answers are right but you’re supposed to find the length of AC and QR (simplified) -13y + 25
P8y + 5 a
QR = 7y + 10

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

When you answer this can you explain

Find the solution of this system of equation -7x+y=-20 9x-3y=36