24 less than six times a number is the same as 21 more than the number

What is the common denominator for 3/5+3/4

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?