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geometry check answer pls

Can someone me with this problem i don't understand i need

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

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply