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Dvinal [7]
2 years ago
12

Which matrix represents the system of equations shown below? 3x - 4y = -8 4x+3y = -19 ​

Mathematics
1 answer:
Angelina_Jolie [31]2 years ago
3 0

Answer:

C

Step-by-step explanation:

if you see the questions it shows you the letter of the number as you can see there are 2 y in an algebra format C is the only one with the letter of the algebra

have a great day ahead :)

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The length of human pregnancies from conception to birth varies according to an approximately normal distribution with a mean of
Varvara68 [4.7K]

Answer:

A) 68.33%

B) (234, 298)

Step-by-step explanation:

We have that the mean is 266 days (m) and the standard deviation is 16 days (sd), so we are asked:

A. P (250 x < 282)

P ((x1 - m) / sd < x < (x2 - m) / sd)

P ((250 - 266) / 16 < x < (282 - 266) / 16)

P (- 1 < z < 1)

P (z < 1) - P (-1 < z)

If we look in the normal distribution table we have to:

P (-1 < z) = 0.1587

P (z < 1) = 0.8413

replacing

0.8413 - 0.1587 = 0.6833

The percentage of pregnancies last between 250 and 282 days is 68.33%

B. We apply the experimental formula of 68-95-99.7

For middle 95% it is:

(m - 2 * sd, m + 2 * sd)

Thus,

m - 2 * sd <x <m + 2 * sd

we replace

266 - 2 * 16 <x <266 + 2 * 16

234 <x <298

That is, the interval would be (234, 298)

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3 years ago
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Answer:

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Step-by-step explanation:

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