Ineed with 4x + 5y = 11 i am confused

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan

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

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left