3 years ago

Are these answers right Or wrong

Mathematics

1 answer:

uysha [10]3 years ago

8 0

They are right except for 12. i think it is C but i could be wrong.

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An airplane takes 3 hours to travel a distance of 1680 miles with the wind. The return trip was 4 hours against wind. Find the s

nasty-shy [4]

Answer:

Speed of plane in still air: 490 mile/hour

speed of wind: 70 mile/hour

Step-by-step explanation:

still speed = x wind speed = w

with wind: speed = still + wind

(x+w) * 3 = 1680 ...a

against wind: speed = still - wind

(x-w) * 4 = 1680 ...b

b-a ... 4x-4w-3x-3w = 0

x-7w = 0

x = 7w

substitution: (7w+w)*3 = 1680 8w = 560 wind speed (w) = 70

still speed (x) = 7w = 490 mile/hour

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3 years ago

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oee [108]

You can solve this by algebraically as well as graphically. When I tried both ways I got:
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3 years ago

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Dmitrij [34]

Answer:

$\frac{1}{18}$

Step-by-step explanation:

So say there are x yellow cubes.

Yellow = x

Blue = 3x

Green = 15x

It doesn't say red so I'm going to assume there are none.

$\frac{x}{18x}=\frac{1}{18}$

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How do you write four and twenty four hundredths in standard decimal form

jek_recluse [69]

4.024 Four and twenty four hundredths

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