All of the following are indicators of a high dependency rate except a. a rapid population growth b. a high death rate and a high birth rate c. a low life expectancy d. a high average age

All of the following are indicators of a "high dependency rate" except low life expectancy.

Explanation:

The dependency rate is defined as the number of dependents "aged 0-14" behind every 1000 care taking adults. When it is said that the life expectancy rate in a particular area is low, it means that the chances of survival of the children in that particular region is low. Thus, lower the life expectancy rate, lower is the dependency rate.

The answer would be plant growth.

I'm pretty sure there's a geometry rule for   anyways, if the triangle is equilateral, and the circle is circumscribed, the circle is outside of the triangle.  to find the area, you need the radius.  the radius should be a straight line from the center of the triangle to any of it's points.  draw lines from the center of the circle to each of the triangle points.  draw three more lines from the center to the middle of the sides of the triangle.  you should now have six separate 30-60-90 triangles inside of your original triangle. use your 30-60-90 rules to solve for the radius, then the circumference.