1. find the minimum or maximum value of f(x) = x - 4x + 12
a. maximum at f(8) = 2
c. maximum at f(2) = 8
b. minimum at f(8) = 2
d. minimum at f(2)= 8

could you also show the steps ?

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