Select all the expressions that could be used to find \( 80 \% \) of \( x \). Be prepared to explain your reasoning.
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To find \( 80\% \) of \( x \), you can use the expression \( 0.80 \times x \). This is because converting a percentage to a decimal involves dividing by 100, thus \( 80 \% \) becomes \( \frac{80}{100} \) or \( 0.80 \). Another way to express this is \( \frac{80}{100} \times x \), which is simply a fraction representing the percentage. Therefore, both \( 0.80x \) and \( \frac{80}{100}x \) would yield the same result of \( 80\% \) of \( x \). You can also represent this with multiplication by the fraction \( \frac{4}{5}x \) since \( 80 \% \) is equivalent to \( \frac{4}{5} \).