Joey cut a 10.5 foot long length of rope into 6 pieces of equal length. how long was each piece of rope

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

Are the corresponding angles congruent? explain why or why not.