Undo is Ctrl-Z. Redo is either Ctrl-Y or in some programs Ctrl-Alt-Z.
Let's call the unknown Z. So the new question is, "If V is the average of X, Y, and Z, then what is Z in terms of V, X, and Y?" This question can now be answered: V=(X+Y+Z)/3 X+Y+Z=3V Z=3V-X-Y
xy + y = z xy = z - y (xy)/y = (z - y)/y x = (z - y)/y
Try Ctrl + Y. There is no common universal shortcut for Redo, although you might find the option in some programs, e.g., Adobe Photoshop.
The expression y^4 - z^4 can be factored using the difference of squares formula. It can be written as (y^2 + z^2)(y^2 - z^2), which can be further simplified to (y^2 + z^2)(y + z)(y - z).
aa, ab, ac, ad, etc. or "now" you know " W, X, Y , and Z. Now I know my ABC's..." in your case, an apostrophe.
If x = y and y = z then x = z
k = 2 Explanation: when z varies directly proportional to x means a division c = z x where c is a constant of proportionality when z varies inversely proportional to x it means a product z y = c now with both k = z y x z = 8 ; x = 12 and y = 3 k = 8.3 12 k = 2
x=abs(y+z) x=+(y+z)=y+z x=-(y+z)=-y-z
-zy or y(-z) and viceversa or y x -z and viceversa
There are 8 different subsets. The null set. {x} {y} {z} {x y} {x z} {y z} {x y z}
If x y and y z, which statement is true