how useful is it to study a country's population pyramid when deciding on what Population policies to implement​

Write each of the following numerals in base 10. for base twelve, t and e represent the face values ten and eleven, respectively. 114 base 5 89t base 12

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test