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Dominik [7]
3 years ago
11

Will give brainliest

Mathematics
2 answers:
xeze [42]3 years ago
6 0

Answer:

<h2><u>7</u>x - <u>7</u>y + <u>21</u> </h2>

Step-by-step explanation:

7(x - y + 3)

=> 7 × x - 7 × y + 7 × 3

=> <u>7</u>x - <u>7</u>y + <u>21</u>

fiasKO [112]3 years ago
3 0

Answer:

7(x - y + 3) = 7x - 7y + 21 \\ thank \: you

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Ex 7) Imagine a mile-long bar of metal such as the rail along railroad tracks. Suppose that the rail is anchored on both ends an
Fantom [35]

9514 1404 393

Answer:

  about 44.5 feet

Step-by-step explanation:

We can write relations for the height of the rail as a function of initial length and expanded length, but the solution cannot be found algebraically. A graphical solution or iterative solution is possible.

Referring to the figure in the second attachment, we can write a relation between the angle value α and the height of the circular arc as ...

  h = c·tan(α) . . . . . . where c = half the initial rail length

Then the length of the expanded rail is ...

  s = r(2α) = (c/sin(2α)(2α) . . . . . . where s = half the expanded rail length

Rearranging this last equation, we have ...

  sin(2α)/(2α) = c/s

It is this equation that must be solved iteratively. We find the solution to be ...

  α ≈ 0.0168538794049 radians

So, the height of the circular arc is ...

  h = 2640.5·tan(0.0168538794049) ≈ 44.4984550191 . . . feet

The rail will bow upward by about 44.5 feet.

_____

<em>Additional comments</em>

Note that s and c in the diagram are half the lengths of the arc and the chord, respectively. The ratio of half-lengths is the same as the ratio of full lengths: c/s = 2640/2640.5 = 5280/5281.

We don't know the precise shape the arc will take, but we suspect is is not a circular arc. It seems likely to be a catenary, or something similar.

__

We used Newton's method iteration to refine the estimate of the angle from that shown on the graph. The iterator used is x' = x -f(x)/f'(x), where x' is the next guess based on the previous guess of x. Only a few iterations are required obtain an angle value to full calculator precision.

3 0
3 years ago
PLEASE HELP!!
tankabanditka [31]

Answer:

A and D

Step-by-step explanation:

4 0
2 years ago
Find the number the comes next 1.2.6,21.88,?​
Nataly_w [17]

Answer

455

Step-by-step explanation:

(1×1) + 1 = 2

(2×2) + 2 = 6

(6×3) + 3 = 21

(21×4)+4 = 88

(88×5)+5 = 445

5 0
2 years ago
Read 2 more answers
What is 45 as a fraction?
Rama09 [41]
A whole number is always written as itself over one.

45/1 

Answer:   45/1
7 0
3 years ago
Joe borrowed $8,000 on a one year note at 13%. How much will Joe owe when the note comes due? 1040 wasn't right.
SpyIntel [72]
<span>$8,000 x 0.13 = $1040

</span>$8,000 + $1040 = <span>$9,040

answer: </span>$9,040
3 0
3 years ago
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