The exchange rate for a stable country: -remains the same unless there is political change.
-changes based on supply & demand
-is based on the U. S. Dollar.
-is based on gold.

The exchange rate for a stable country:

Explanation:

The exchange rate of a stable economy changes based on the market forces of demand and supply. The demand and supply for a country's currency will be influenced largely by prevailing economic conditions in that country. Political and other social reasons will not affect the exchange rate of the country.

An increase or decrease of a country's products in the international market is one of the reasons for an increase or decrease in the demand for its currency.

bd = 9 cm

step-by-step explanation:

in a 30°-60°-90° triangle, the ratio of side lengths is 1 : √3 : 2. that is, the longest side (hypotenuse) is twice the length of the shortest side.

all of the triangles in your geometry are 30°-60°-90° triangles. ac is the hypotenuse of δacd, and the short side of δabc.

the short side ad of δacd will be half the length of ac, so 3 cm. the hypotenuse ab of δabc will be twice the length of ac, so 12 cm. segment bd is the difference of the lengths ab and ad, so is

bd = ab -ad

bd = 12 cm - 3 cm = 9 cm

comment on side length ratios

you can figure the ratios of side lengths in a 30°-60°-90° triangle by considering the trig ratios of the angles. or you can figure the length of the altitude of an equilateral triangle of side length 2 using the pythagorean theorem.

answer; (b) insider trading;