Please help ill give brainliest thanks!

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

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

Math it's appreciated. (picture provided)