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John recently received his semester grades and found that he had failed two courses. he says the reason he failed the two courses is that they were taught by female professors. john believes that women are really not smart enough to teach at the college level. in this example, the female professors are a) spacegoats and being blamed for john's grades b) being discriminatory toward john c) probably not smart enough to teach in a college d) prejudiced against john because he is male

Explain why societies cannot make a choice above their production possibilities frontier and should not make a choice below it.

If you were to measure the distance from earth to saturn, would you use au? why?