Can any of y’all help me with this question?

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?

How many grams the dog will eat in 3 days?

Tom drove 206 miles in 3.9 hours. estimate his average speed.