The reflective paint is to be applied by paint sprayer to the joists and to the underside of the roof's plywood sheets, where the asphalt singles are nailed down. The theory behind it was that most infra-red heat waves that penetrate the roof and heat up the attic air space are redirected or reflected back to outside of the attic.
Landlord tenant laws vary by jurisdiction. Typically, if a landlord refuses or neglects to carry out repairs, you have the right to go to a landlord tenant court, where a judge can order the repairs done or can even order a rent rebate. In this case, you could also contact the fire department, who would likely carry out an inspection of the alarms.
Sounds like this is for a class, but conceptually space is a giant rubber sheet. The Sun has 99.8% of the mass of the entire system so it bends the rubber sheet so much that all the 8 planets, 5 dwarf planets, hundreds of moons and asteroids are all caught in the bend caused by the Sun. It is being caught in the bend of the Sun that keeps the planets from flying off into the distance. All objects in space physically bend the space. The more massive an object becomes, the more it bends space, hence the stronger it's gravity.