Aleather ball has a diameter of 28.4 cm. which is the area of the piece of leather used on the surface of the ball?

Step-by-step explanation:

The ball has the form of sphere

Diameter is:

Surface area of a sphere is:

Substitute values:

560

hope this : )

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles