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babymother [125]
3 years ago
11

The Des Plaines River Bridge is 2.1 km long. Engineers are considering re-lighting the bridge with a pole placed every 100 feet

of the bridge length starting from the south end. Each pole will support four light globes. How many globes will be required for the re-lighting project?
Mathematics
2 answers:
Basile [38]3 years ago
8 0
228
hope this helped!
kap26 [50]3 years ago
5 0
Now, there are 3280.84 feet in 1 kilometer, so, how many feet are there in 2.1km? well, 2.1 * 3280.84 or 6889.764 feet.

now, they're putting globes on intervals of 100ft, however, how many times does 100 go into 6889.764? well 6889.764/100  which is rounded up 68.9.

so, that means roughly 69 poles, however, the division excludes the starting point, so if we include that, because is lighting and thus it needs to include the starting point of the bridge, so that'd be 70 poles then.

each pole with 4 globes, 70 * 4 globes then.
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Tpy6a [65]

Answer:

y = 9.84 mm

Step-by-step explanation:

<h2>Sine rule:</h2>

Law of sine:

   \sf \boxed{\bf \dfrac{a}{Sin \ A}=\dfrac{b}{Sin \ B}= \dfrac{c}{Sin \ C}}

    a = y

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   b  = 17 mm

    B = 117°

\sf \dfrac{y}{Sin \ 31^\circ}=\dfrac{17}{Sin \ 117^\circ}\\\\

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Find the number, if 0.7 of it is 42.
gizmo_the_mogwai [7]

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Step-by-step explanation:

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3 0
3 years ago
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Caroline earns $49000 a year, and her friend Jennifer earns $51000 a year but doesn't belong to a health fund. The tax rule this
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Answer:

Caroline has to pay $8600 taxes

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Step-by-step explanation:

I guess the question is who has to pay how much taxes, right ?

Caroline earns $49000, and I guess, she belongs to a health fund.

she has to pay $5000 for the first $40000.

and for the remaining $9000 she has to pay $0.40 per dollar.

that means 9000×0.4 = $3600

and no penalties for no health fund.

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Jennifer earns $51000 and did not belong to a health fund.

she has to pay $9000 for the first $50000.

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that means 1000×0.3 = $300

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