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kkurt [141]
3 years ago
9

Help! :)

Mathematics
1 answer:
Fiesta28 [93]3 years ago
5 0
A) 17.26
B) 1.21 meters
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The world’s fastest train travels about 162 mi/h. Estimate how far the train travels in 4.75 h.
kirill [66]
When using estimation, we usually will round up or down depending. 

162= rounds down to 160

4.75= rounds to 5

160*5= 800

It travels around 800 miles in 5 hours.

I hope this helps!
~kaikers
4 0
3 years ago
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I dont really understand this
galina1969 [7]

Answer:

1. a^-b

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Nonamiya [84]

Answer:

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5 0
3 years ago
Find the sum of the convergent series 7 0.7 0.007
mafiozo [28]
7+0.7+0.007+\cdots=7\left(1+\dfrac1{10}+\dfrac1{100}+\cdots\right)

Let S_n denote the nth partial sum of the series, i.e.

S_n=1+\dfrac1{10}+\dfrac1{100}+\cdots+\dfrac1{100^n}

Then

\dfrac1{10}S_n=\dfrac1{10}+\dfrac1{100}+\dfrac1{1000}+\dfrac1{10^{n+1}}

and subtracting from S_n we get

S_n-\dfrac1{10}S_n=\dfrac9{10}S_n=1-\dfrac1{10^{n+1}}
\implies S_n=\dfrac{10}9\left(1-\dfrac1{10^{n+1}}\right)

As n\to\infty, the exponential term vanishes, leaving us with

\displaystyle\lim_{n\to\infty}S_n=\dfrac{10}9

and so

7+0.7+0.007+\cdots=7.777\ldots=\dfrac{70}9
3 0
3 years ago
4x-5y+2z=-3<br> 6x+4y+9z=8<br> 11x-2y-z=7
Nutka1998 [239]

Answer:

thank you i need that

Step-by-step explanation:

4 0
4 years ago
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