20% of 500 is what? Please tell me the answer

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

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

What is x and y intercepts for y=x+7