In a recent year a letter to europe from the united states costs .94 cents to mail. a letter mailed within the united states costs .44 cents. nancy mailed 5 letters for 3.70, some to europe and some to the united states. how many letters did she send to europe?

What is the product of the radical expression. (7-2square root) (8+2 square root)

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 is the difference between the predicted value and the actual value