9 digits in a zip code
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m(a + b) = ma + mb distributive property (a + b)(c + d) = a(c + d) + b(c + d) The use distributive prop. twice. (c + d)(x + y + z) = c(x + y + z) + d(x + y + z) Still use dist. prop. etc. These work for subtraction as well.
z remains undefined.
If y = a + bi and z = c + di are two complex numbers then z - y = (c - a) + (d - b)i
In mathematics, a plane is a flat surface in three-dimensional space. The equation of a plane has the form a*x + b*y + c*z = d, where a, b, c, d are some specific numbers and x, y, z are variables. A plane is then the collections of all points (x, y, z) satisfying the plane equation. In higher mathematics (linear algebra) we can view a plane as the set of all vectors <x,y,z>, such that the dot product between <x,y,z> and <a,b,c> is the constant d, where <a,b,c> is a vector perpendicular to the surface of the plane.
No, z does not represent a Roman Numeral. The letters used are I, V, X, L, C, D and M.