I really need help and I would appreciate an explanation but it’s not needed thank you

Find the volume of the wedge cut from the first octant by the cylinder z=12-3y^2 and the plane x+y=2.

The population in a city is modeled by the equation p(d)= 100,000*(1+0.3) where d is the number of decades since 1970

Megan and desmond each add the same amount of water to their aquarium megan makes 5 ml of chemical solution with every gallon of water for her aquarium desmond mixed 8 ml of chemical solution for every 2 gallon of the water for his aquarium.