What's the domain and range of f()=-3x+ 7

Pick the description of a geometric object that best matches the real world object box for a deck of card

Tyler enjoys the fish so much that after his birthday his family decides to take him to a famous aquarium a tank at the aquarium is similar to his tank with the scale factor of 8 how many times greater is the volume of the tank at the aquarium than the volume of tyler tank

Hi, can anyone show me how to do this problem? 100 points for this. in advance