How many repeating digits are in 0.64

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.

Using two or more complete sentences, describe how you can find a vector parallel to b=-2,3

Add the fractions and simplify 1/2+ 1/3