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dedylja [7]
2 years ago
14

What percentage of the area under a normal curve is within 1, 2, and 3 standard deviations of the mean

Mathematics
1 answer:
Lemur [1.5K]2 years ago
7 0

Answer:

You need to have a labotomy sir

Step-by-step explanation:

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- 3(2x - y) + 2y + 2(x + y) \\  - 6x + 3y + 2y + 2x + 2y \\ =   - 4x + 7y

I hope I helped you^_^

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Read 2 more answers
(a) Use the fundamental theorem of algebra to determine the number of roots for 2x^2 + 4x + 7
zysi [14]

Answer:

Step-by-step explanation:

A 2nd order polynomial such as this one will have 2 roots; a 3rd order polynomial 3 roots, and so on.

The quadratic formula is one of the faster ways (in this situation, at least) in which to find the roots.  From 2x^2 + 4x + 7 we get a = 2, b = 4 and c = 7.

Then the discriminant is b^2 - 4ac, or, here, 4^2 - 4(2)(7), or -40.  Because the discriminant is negative, we know that the roots will be complex and unequal.

Using the quadratic formula:

       -4 ±√[-40]         -4 ± 2i√10

x  = ------------------ = ------------------

                4                       4

                                       -2 ± i√10

Thus, the roots are x = ------------------

                                               2

4 0
3 years ago
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