Nina's grades could be better. She gets about five hours of sleep every weeknight and ten hours per night on weekends. How much sleep should she get to better concentrate on schoolwork? Five to six hours every night nine to ten hours every night a total of forty hours a week a minimum of eighty hours a week

B. Nine to ten hours every night

Explanation:

You need to have at least 8 hours of sleep and B makes the most sense cause then she gets enough sleep and enough time to study.

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there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?