Please help solve x and z find the number for x and find what degrees is z

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

Solve the system of equations y= 3/2 - 1, -x+ y =-3

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)