Asquare sticky note has an area of 81 square centimeters. how long is each side of the sticky note?

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

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