If a furniture store buys a coffee table from a manufacturer for $120 and sells it as a 100% markup, what is the selling price of the coffee table?

Find the total area for the regular pyramid ( follow the answer set up in the picture)

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 many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.