Question

2. Which are the central problems of an economy?
3. Define utility​

Answer 1

An economic problem generally means the problem of making choices which occurs because of the scarcity of resources. The economic problem arises because people have unlimited desires but the means to satisfy that desire is limited. Therefore, satisfying all human needs are difficult with limited means.

Within economics, the concept of utility is used to model worth or value. Its usage has evolved significantly over time. The term was introduced initially as a measure of pleasure or satisfaction within the theory of utilitarianism by moral philosophers such as Jeremy Bentham and John Stuart Mill. 

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Answer 2

$2. Which \: are \: the \: central \\ problems \: of \: an \: economy?$

The basic economic activities of life are production, distribution and disposition of goods and services. A society will be facing scarcity of resources during the time of fulfillment of these activities .

$3. \: define \: utility$ ?

Utility is a term in economics that refers to the total satisfaction received from consuming a good or service. ... The economic utility of a good or service is important to understand, because it directly influences the demand, and therefore price, of that good or service.