There were some ducks swimming in the pond.15 of them flew away, and another 17 ducks flew in. if there were 24 ducks after that, how many ducks were swimming in the pond at first?

Subtract the number that flew in from the total at the end:

24 - 17 = 7

Now add the number that flew away to that:

15 + 7 = 22

There were 22 ducks.

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²