a group of 16 people is choosing a chairperson and vice chairperson They put all 16 peoples name into a hat the first name drawn becomes chair second name becomes vice chair How many possible combinations of chair and vice chair are there?​

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.

Billy plotted −3 4 and −1 4 on a number line to determine that −3 4 is smaller than −1 4 .is he correct? explain why or why not

If f(x)=x+7 and g(x)=1/x what is (fog)(x)