What is the circumference of 13 mm and the area need the work shown also​

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

Select the correct answer from each drop-down menu. james needs to clock a minimum of 9 hours per day at work. the data set records his daily work hours, which vary between 9 hours and 12 hours, for a certain number of days. {9, 9.5, 10, 10.5, 10.5, 11, 11, 11.5, 11.5, 11.5, 12, 12}. the median number of hours james worked is . the skew of the distribution is