X
The letter "x" is often used in algebra to mean a value that is not yet known.
It is called a "variable" or sometimes an "unknown".
In x + 2 = 7, x is a variable, but we can work out its value if we try!
A variable doesn't have to be "x", it could be "y", "w" or any letter, name or symbol.
See: Variable
- algorithm
- alternate exterior angles
- alternate interior angles
- alternating series
- altitude
- altitude (geometry)
- am
- amplitude
- analog
- analog clock or watch
- analogy
- and
- angle
- angle bisector
- angle of depression
- angle of elevation
- annual
- annual percentage rate (apr)
- annual percentage yield (apy)
- annulus
- anticlockwise
- antiprism
- apex
- apothem
- approximation