Javier worked the following hours in a month of October. what was the percent of change from week 2 to week 4 what it in increases or decrease

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

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

Which is the focus of a parabola with equation y2=4x