Mean of four numbers a ,b, c, and d is 8 and mean of seven numbers x , y ,z ,a, b, c and d is 12 . Find the mean of x, y and z.

don't know I have a lot of homework to do and I will do it it tomorrow so I have no time to do yours so I am sick and tired of everything and the miserable marks I have been getting after staying awake for hours I wanna be successful but nothing is working

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!