After John worked at a job for 10 years, his salary doubled. If he started at $x, his salary after 10 years is
$1x
$x + 2
$x-2
$2x

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?