What is 9+9+9+9+9+9+9++999+9+9+9+9+9+9+9+9+ 999999+99999++9+9+9+9=? (also random pic of me after my SOL, my teacher stood there and stared at me the whole time LOL)​

Ihave a 69 and an 82. the 69 is worth 40% of my grade and the 82 is worth 15%. can someone tell me my current average grade.

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

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')