Which of these changes to a modern lifestyle would promote the development of more-sustainable practices in the world food system?

Can someone plz me and put everything in your own words

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?

Which of the following is true of concerts a. concepts prevent us from generalize b. concepts independent of experiences and object. c. concepts complicate the memory process d. concepts provide clues about how to react to a particular object or experience