Any help? someone? im bad at ratios

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

What is the number 321,000,000 in scientific notation? also what is the number? ?

Find the root(s) of f (x) = (x- 6)2(x + 2)2.