book Maths Puzzle Numerical Ability

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

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3=5 then the square root of x=13? I am soooooooooooo lost in my algebra class! I dont know how to do any of this! Use the distributive property to simplify: 98*7.
Instructor shows answer as 700-14=686.
How? Why?