Ray MP is the bisector of m

Using complete sentences, explain the differences between a command economy and a market economy. what type of economic system is created when these two systems are combined? what are the benefits of combining these two systems?

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4