Air is escaping from a spherical balloon at the rate of 2 cm3 per minute. How fast is the surface area shrinking when the radius is 1 cm? = ! " and = 4# "
where V is the volume and S is the surface area, r is the radius.

True , im kinda sure

Iwould say either b or ci could be wrong let me know

The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun.