CAN SOMEONE PLEASE HELP ME WITH THIS PLEASE!!

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

Ill mark the brainliest if you me with the these three questions 7,8,9

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?