2 1/2 x 3 1/5 fast please

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?

Which function is shown in the graph below?

Abus travels 36 miles in 45 minutes. enter the number of miles the bus travels in 60 minutes at this rate.