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elena-14-01-66 [18.8K]
3 years ago
9

Which of the following statements is false?

Mathematics
1 answer:
vodomira [7]3 years ago
6 0
A. The some of two rational numbers is always rational .
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A dollar bill is about 15.5 cm long. If seventeen trillion dollar bills were laid end to end around the Earth's equator, how man
Mariana [72]

Answer:

The dollar bills would encircle earth 65753.1 times

Step-by-step explanation:

We have

Length of dollar bill = 15.5 cm

Total dollar bills = 17 trillion = 17\times 10^{12}

Thus the length of 17 trillion dollar bills equals

15.5\times 17\times 10^{12}cm\\\\=263.5\times 10^{12}cm\\\\=\frac{263.5\times 10^{12}}{10^{5}}km\\\\=263.5\times 10^{7}km

Now taking shape of earth as a perfect sphere the circumference of earth becomes

C=2\pi r\\\\=2\times \pi \times 6378km\\\\=40074.1558km

Thus the number of times the dollar bills would encircle earth equals

\frac{263.5\times 10^{7}km}{40074.1558km}=65753.21times

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3 years ago
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cluponka [151]

Answer:

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Step-by-step explanation:

5 0
3 years ago
Exchange rates help you to know ____.
Vika [28.1K]

Answer:

B

Step-by-step explanation:

how much your currency is worth in a different currency

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3 years ago
Which ordered pair (x, y) is a solution to given system of linear equations?
riadik2000 [5.3K]

Answer:

(1, - 2 )

Step-by-step explanation:

Given the 2 equations

3x + y = 1 → (1)

5x + y = 3 → (2)

Subtracting (1) from (2) term by term eliminates the term in y, that is

(5x - 3x) + (y - y) = (3 - 1) and simplifying

2x = 2 ( divide both sides by 2 )

x = 1

Substitute x = 1 in either of the 2 equations for corresponding value of y

Using (1), then

3 + y = 1 ( subtract 3 from both sides )

y = - 2

Solution is (1, - 2 )

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3 years ago
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lukranit [14]
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