It depends on the "type of problem" given; however these are the main "distance formulas" given in Algebra I:
Distance = Rate x Time, finding distance traveled by an object over a given time period. This can also be used for any rate & time problem (the baker bakes 4 cupcakes a minute, and was baking cupcakes for 6 minutes today, etc.)
If two points are (x1, y1) and (x2, y2), then the distance between the two points is (x1-x2)^2 + (y1-y2)^2.
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The difference is that first you have to understand the problem and translate it into an equation (or equations).
An equation is a ploblem with no answer and an expression is a problem with an answer so you'll get different answers with an equation and an expression.
1. Given 2. Find 3. Equation 4. Solution
What role of operations that applies when you are solving an equation does not apply when your solving an inequality?"
When you simplify, you are just taking the equation down to it's simplest form, not solving it. Evaluation involves actually solving the problem.