the = sign
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The math symbol for "no fewer than" is typically represented by the greater than or equal to symbol, which is denoted as ≥. This symbol indicates that a value must be greater than or equal to a certain number. For example, if you see the expression x ≥ 5, it means that x must be 5 or any number greater than 5.
"The coefficient of the x^2 term must be positive" is a condition that does not have to be met.
you must land always in * and \ to have a zero point
Not necessarily. But a parallelogram with perpendicular diagonals must always be one.
You must find the slope, if it is positive, then the line is always increasing. If it is negative, then the line is always decreasing.