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hram777 [196]
2 years ago
11

How many different 4 digit numbers can be formed using only digits 1,2,3 and 4 given that they contain each of these digits as m

any times as you want?
Mathematics
1 answer:
Mrrafil [7]2 years ago
5 0

Answer: 4

Step-by-step explanation:

yeh

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Find the cube of :<br> (2a-b)
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(12 points) A 13 foot long ladder leans against a wall and the foot of the ladder is sliding away from the wall at a constant ra
Viefleur [7K]

Answer:

  19/13 ft/s ≈ 1.4615 ft/s

Step-by-step explanation:

It may be convenient to choose the time reference as the instant where we want to compute dh/dt. That is, we want to find h'(0).

If w represents the height of the ladder on the wall, we can write two relations: one for w, and one for h, the height of the firefighter.

  w² + x² = 13² . . . . . . where x=5+3t is the distance of the foot of the ladder from the wall

  h = w·(4 +2t)/13 . . . . where 4+2t is the length along the ladder that the firefighter has climbed

__

Differentiating with respect to time, we get ...

  2ww' +2xx' = 0

  w' = (-x/w)x' = -3x/w . . . . . solving for w'

and ...

  h' = w'(4 +2t)/13 +w(2/13) . . . . . . . using the product rule

  h' = (-3x/w)(4 +2t)/13 + w(2/13) . . . . filling in w'

__

At t=0, x=5, w=12. and we have ...

  h' = (-3·5/12)(4/13) +(12·2)/13 = 19/13 ≈ 1.4615

dh/dt = 19/13 ft/s ≈ 1.4615 ft/s at the given instant

_____

The attachment shows a solution using a graphing calculator. It gives the same result.

3 0
2 years ago
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