Economists state that every decision involves trade-offs. economists measure and define these trade-offs as: a. productions possibilities curve. c. circular flow of economic activity. b. paradox of value. d. opportunity costs. select the best answer from the choices provided

Option D i.e Opportunity Costs is the correct answer.

Economists define trade-offs in simple terms as a situational decision where a person chooses a thing over the sacrifice of another thing,owning to limited resources and time.

Opportunity Cost of a choice is what you gave up to get it. For example, you gave up the idea of watching movie tomorrow in order to go for a dinner.

after the civil war, and with the termination of slavery, the south was faced with a big problem; what was supposed to happen and how they were supposed to deal with the freedom and the rights that black people and freed slaves had gained as a result of the north defeating the south and forcing the end of slavery. first, most, if not all, of the workforce of the south came from slaves and they did not have an option to replace the loss of said workforce. second, particularly in the south, people were convinced that black people were lesser, less intelligent, less capable and less smart than whites. this posed a huge problem for them. also, southerners were faced with another issue; freed slaves now had a say in how their lives would be lived and the right to politically choose the way they would be governed. people in the south did not want to accept this, none of this and this opposition and the conflicts that arose from it, not to mention the afereffects of the war, forced the congress of the time to enact and enforce the reconstruction plans that had been proposed by president andrew johnson.

254.34

step-by-step explanation:

the formula for area of a circle is given by

a = pi * r^2

a = pi * 9^2

a = 81*pi

using 3.14 as an approximation for pi

a = 3.14*81

a = 254.34