98 points people! So answer it plz.

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?

Solve the equation by completing the square. x^2+2x=17

Find the maximum value of p= 4x + 5y subject to the following constraints :