For questions uneasy to see, they will be typed out: #36
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36) when the federal reserve decreases the reserve requirement, which of the following occurs?
a. increases the money supply
b. decreases the money supply
c. increases government sending
d. decreases interest rates

D is the answer for 36.

31. sentence 3 best supports the main idea with a tragic example.

32. Price ceiling, controls the maximum prices that can be charged by suppliers for the commodity.

33. I think this one's marginal cost because it might take a lower the price for a little while but then permanently take a sharp turn in price making it higher.

34. I think it's voluntary exchange since the transaction for the service is free trade.  

35. Increase sale bonds, the Feds wanted discounts to attract new buyers.

37.  A force that causes self-interest to promote the interest of society

38. I think its rational self-interest because he's thinking of himself and his own security.

Sorry I'm late :)

Oh and tell me if I'm wrong on anything.

answer; negative punishment;

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.