By applying the PEMDAS rule, the given expression "1 × (-4) - 8 × - 3/9" is equal to -20/8.
An expression can be defined as a mathematical equation which is used to show the relationship existing between two or more variables and numerical quantities.
In order to evaluate this expression, we would apply the PEMDAS rule, where operations within the parenthesis are first of all evaluated, followed by exponent, and then multiplication or division from the left side of the expression to the right. Lastly, the operations of addition or subtraction would be performed from left to right.
Expression = 1 × (-4) - 8 × - 3/9
Expression = -4 - 8 × - 3/9
Expression = -4 - 8 × 1/3
Expression = -4 - 8/3
Expression = -4/1 - 8/3
Expression = (-12 - 8)/3
Expression = -20/8.
Read more on expressions here: brainly.com/question/12189823
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