What, how, for who does command and mixed economic system produce? (Pls help me answer each questions for command and mixed)

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.

If there were no system of checks and balance,the process of government would eventually fall apart. do you agree with this opinion? why or why not?

Which of the following scenarios is an example of attentional blink? click or tap a choice to answer the question. while grading a student’s essay, a professor does not notice the mistake in the following sentence: “metacognition is the the awareness of one’s own thought processes.” a waiter is telling two friends about the daily specials when a neighboring table erupts in laughter. the friends ask the waiter to repeat the last few items because their attention was diverted by the sudden loud laughs. you watch television while you study for a language exam. the next day, you are unable to recall the majority of the new vocabulary you thought you had memorized. you are at a loud concert, and you are able to concentrate on the music while blocking out the conversations around you, cell phone rings, and other irrelevant stimuli.