an equation
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You have one equation in two unknowns. There is no solution possible without a second (independent) equation in the same two unknowns.
Depends on the type of math problem. there's usually an equation to see if there is a solution or not.
You do it wrong. With out order of operations, the same math problem could have several different answers. In math, there is only one answer.
An estimated math answer is one that is guessed based on what you know without actually doing the problem.
Percent decrease is when your overall percentage goes down. Example: I take a 4 problem math test and get one wrong, 75%. I take a 2 problem math test and get one wrong, 50%.