What is 13/20 written as a decimal?

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.

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

How can i differentiate this equation?