Find the value of given expression

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How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

High schoolmathematics 5 points keith is the leading goal scorer for a team in an ice hockey league. last season, he scored 42 goals in 82 games. assuming he scores goals at a constant rate, what is the slope of the line that represents this relationship if the number of games is along the x-axis and the number of goals is along the y-axis?

Find the number of liters in 12.8 gal of gasoline. round to the nearest hundredths