David's backpack weighs x pounds. Kenias backpack weighs 4/3 less then that

Me what is the value of x? showing work would be appreciated - ! : )

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

Can someone me and do the problem plz so i can understand it more better