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stiv31 [10]
3 years ago
15

Which of the following values represents an index of refraction of an actual material? A. 1.25 B. 0 C. .25 D. .5

Mathematics
1 answer:
Artist 52 [7]3 years ago
6 0
A is your answer .-.
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A cement walkway of uniform width has been built around an in-ground rectangular pool. the area of the walkway is 1344 square fe
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Answer:

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Step-by-step explanation:

Dimensions of the Pool =80 feet long by 20 feet wide

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1344=(80+2w)(20+2w)-(80*20)\\1344=80*20+160w+40w+4w^2-80*20\\4w^2+200w=1344\\4w^2+200w-1344=0\\We factorize\\4(w^2+50w-336)=0\\4(w^2-6w+56w-336)=0\\w(w-6)+56(w-6)=0\\(w-6)(w+56)=0\\w-6=0$ or $ w+56=0\\w=6$ ft or $ w=-56$ \\Therefore, the width of the walkway , w=6 feet.

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In a sample of 100 students, 30 wear size medium t-shirts. Use a proportion to calculate approximately how many medium t-shirts
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