Usually it means, people who look of mixed race, where you cannot tell what their ethnic background is because they could pass for a few different types of races or ethnic cultures
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It means that someone is looking out for you and that they will make sure that nobody hurts you
Replace each variable in the expression by its value and then find the value of the expression.
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A Numerical Expression is an expression only using numbers.
An algebraic expression is a collection of terms with no equality sign