Explain how the expressions 2(2x+4/5) also represents the perimeter of the rectangle

Lilianna uses 3/4 calories per minute just by sitting. she uses 1 more calorie per minute by walking. lilianna uses a total of 12 1/4 calories walking to the park. lilianna uses the equation, d(.75+1)=12.25 to represent the situation. what does the variable d represent in the equation?

Write an equation for the function that includes the points (2,100)and (3,100)

How can you find the mean absolute deviation (mad) for this set of data?