A person invested $140 in an account growing at a rate allowing the money to double every 15 years. How long, to the nearest tenth of a year would it take for the value of the account to reach $280?

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.