Which two charges have the sum of 0

Why do interests rates on loans to be lower in a weak economy than in a strong one

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

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?