Kim roof was leaking and the hardware store said a new roof sealant product would fix the roof. each can of roof sealant covers 100 square feet. the roof was 23 feet long and 15 feet wide. how many cans of roof sealant is needed to buy?

Will give brainliest what is the value of x? enter your answer in the box.

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

How do you solving the solution of each system using elimination?