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Telephone lens. formula 1/f = 1/o + 1/i. Find the image distance i for an object that is 2,000,000 mm from a 250-mm telephone lens.

Kesha has collected the autographs of nine more television celebrities than she has of movie stars. Each TV celebrity autograph is worth $75 and each movie star autograph is worth $250. Her collection is valued at $2,300. How many TV celebrity autographs does she...

Every year in half moon bay, there is a pumpkin contest to see who has grown the largest pumpkin for that year. Last year, one grower brought 5 pumpkins to the contest. Instead of weighing them one at a time, he informed the judges, "When I weighed them two at a time,...