A bag contains 150 marbles. Some are red and the rest are black. There are 28 red marbles for every 2 black marbles. How many red marbles are in the bag?

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

The sum of two numbers is 86, and their difference is 20. find the two numbers

Abouncy ball is released from a certain height. on the first bounce, it travels 32cm. with each subsequent bounce, it travels 9/10 the distance of the previous bounce. what is the total distance that the ball has traveled when it completes its 25th bounce?