How do I do box and whisker plots?

What is the smallest integer n such that n\sqrt{2} is greater than 20

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

How many solutions does the nonlinear system of equations graphed bellow have?