Un latón es una aleación metálica de zinc con cobre. Para confeccionar una tubería de latón, una fábrica combina 4 partes de zinc en 21 partes de cobre. Calcular la cantidad de cobre y de zinc que hay en 200 kg de latón.

The long jump record, in feet, at a particular school can be modeled by f(x) = 19.6 + 2.5ln(x + 1) where x is the number of years since records began to be kept at the school. what is the record for the long jump 11 years after record started being kept? round your answer to the nearest tenth.

Me with this one question, and i'll upvote the brainliest answer

How do you find the circumfrance of a circle?