The population of a country has been decreasing for several decades. in 1990, the population was about 138 million people. in 2010, the population was about 131 million people. determine the percent decrease in the country's population during this time period. the country's population decreased by about nothing % during this time period.

The country's population decreased by about 5.07% during this time period.

Explanation:

A natural decrease occurs when the death rates fall below the birth rates. Reduction of fertility rates can occur because families choose to have fewer children due to adults following careers or introduction of contraception. If life expectancy increase due to improved health care then a lot of the countries population will be elderly dependand age range has a high death rate.

the first question's answer is a.

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.