How is the number 9 different in the numbers 7,923 and 2,490?

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

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

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c