Acard shop sold 172 cards on friday. it sold 258 cards on saturday.

about how many more cards did the shop sell on saturday than on friday?
(give your answer to the nearest 10 cards.)

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 the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12