Which of these is an example of a recurring-payment variable annuity

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

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?