Which property explains why these two expressions are equal?

a(b + c) = a(c + b)

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

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?