What is 3 plus 2/3 plus 1/4

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?

What could explain what happened when the time was equal to 120 minutes

Which of the following represents the length of a diagonal of this trapezoid?