Amachine coats metal spheres with a plastic coating. the metal spheres have a radius of 9 mm. the spheres formed by the metal and plastic coating have a radius of 12 mm.
how much plastic coating is on each sphere?
use 3.14 to approximate pi and express your final answer in hundredths.

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year the population of her town is changing by a constant rate

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

The formula for the lateral area of a right cone is la = rs, where r is the radius of the base and s is the slant height of the cone.which are equivalent equations?