It is possible to define a number of different metrics (measures of distance) on a space and the formula will depend on the metric.
A simple pair of metrics to illustrate: imagine a town with a road layout like downtown Manhattan. Streets and Avenues at right angles to one another. The distance from one corner to another is a number of avenues across plus a number of streets up (or down). This is known as the taxicab or Minkowski metric. An alternative measure is a "as-the-crow-flies" distance. Both measures are perfectly valid but will give rise to different formulae. There are other metric, too.
A term is a single part of an expression or of an equation in algebra.
how do you set the equation in algebra to solve 42 nickles to 19 dimes
a problem with an equal sign
Use equation.
The answer depends on what exactly you mean by doing an equation!
Without algebra tiles?
YES!! You use algebra in your everyday lives. Adding is considered an equation. An equation is a problem with an equal sign. An expression has no answer (an equal sign).
It is the unknown variable
algebra
Speed=distance/time. Speed is in meters per second if distance is in meters, and time is in seconds. Using simple algebra, the equation can be rearranged to solve for a missing variable (speed, distance, or time). therefore: distance=speed x time time= distance/speed
It is not an equation because it's an algebraic expression
An algebraic equation is a mathematical equation in which one or both sides is an algebraic expression.