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Nikolay [14]
3 years ago
11

. What's the correct letter name for Ð1 below? A. B. C. D.

Mathematics
1 answer:
aksik [14]3 years ago
4 0

The answer seems to be C

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Expansion Numerically Impractical. Show that the computation of an nth-order determinant by expansion involves multiplications,
posledela

Answer:

  • number of multiplies is n!
  • n=10, 3.6 ms
  • n=15, 21.8 min
  • n=20, 77.09 yr
  • n=25, 4.9×10^8 yr

Step-by-step explanation:

Expansion of a 2×2 determinant requires 2 multiplications. Expansion of an n×n determinant multiplies each of the n elements of a row or column by its (n-1)×(n-1) cofactor determinant. Then the number of multiplies is ...

  mpy[n] = n·mp[n-1]

  mpy[2] = 2

So, ...

  mpy[n] = n! . . . n ≥ 2

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If each multiplication takes 1 nanosecond, then a 10×10 matrix requires ...

  10! × 10^-9 s ≈ 0.0036288 s ≈ 0.004 s . . . for 10×10

Then the larger matrices take ...

  n=15, 15! × 10^-9 ≈ 1307.67 s ≈ 21.8 min

  n=20, 20! × 10^-9 ≈ 2.4329×10^9 s ≈ 77.09 years

  n=25, 25! × 10^-9 ≈ 1.55112×10^16 s ≈ 4.915×10^8 years

_____

For the shorter time periods (less than 100 years), we use 365.25 days per year.

For the longer time periods (more than 400 years), we use 365.2425 days per year.

8 0
3 years ago
The Smith Family made an $800 down payment and pays $75 per month for new furniture. At the same time the Cooper family made a $
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75m + 800 = 95m + 500
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4 0
3 years ago
11. Cammen measured a room to be
Brut [27]

Answer:

120.0

i hope this helped! please mark me as brainliest and 5 stars >:)

Step-by-step explanation:

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2 years ago
Find the general solution to "+′−6=3^2
BaLLatris [955]

Answer:

answer is -6=9

Step-by-step explanation:

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2 years ago
Hey there is a link! It would mean a lot if you would give me the awnsers to these 3 questions! It’s grade 7 math! Thanks, all y
joja [24]

Answer:

a

Step-by-step explanation:

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3 years ago
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