306 divided by 4 plz answer cuz i need this homework in by wednesday

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?

Does anyone know how to do geometryme with this problem

What is the value of x in the following equation. -x ^3/2 = -27