book Maths Puzzle Numerical Ability

Use the distributive property to simplify: 98*7.
Instructor shows answer as 700-14=686.
How? Why?

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Hi I have to create a real-life situation that follows a linear equation, with the independent variable being years. What would the slope tell you about future years? I have tried If three-fourths of a man's age is 36 years,how old is he?