Can somebody me with these 3 questions?

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 length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?

What is the surface area of a cube with the volume of 729 ft?