Find the are of the first one and the circumference of the second one : )

Step-by-step explanation:

The area formula is ...

  A = πr²

When r = 1/4 in, the area is ...

  A = π(1/4 in)² = π/16 in²

__

The circumference formula is ...

  C = πd

When the diameter is 3/4 in, the circumference is ...

  C = π(3/4 in) = (3/4)π in

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m