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zmey [24]
3 years ago
15

Do number one please and make sure to show your work thank you

Mathematics
1 answer:
kakasveta [241]3 years ago
5 0

Answer:

24.9

Step-by-step explanation:

Law of cosines is : a^2 = b^2 + c^2 - 2bc(cos(A))

<em>Plug in 23 and 15 for b and c, and 23 for A</em>

a^2 = 23^2 +15^2 - 2(23*15)(cos(23))

Simplify

a^2 = 254 -690cos(23)

<em>Simplify</em>

<em />a= \sqrt{254 -690cos(23)\}<em />

Solve

approx . 24.9

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HELP ASAP!!! I SUCK AT MATH AND I DON’T understand this!!!
anyanavicka [17]

Answer:

Part A:

\frac{13}{20}

Part B:

\frac{1}{39}

Step-by-step explanation:

The total number of candies is 40.

10 + 14 + 4 + 12 = 40

14 are Butterfinger and 12 are Crunch.

14 + 12 = 26

\frac{26}{40}

\frac{26}{40}=\frac{26/2}{40/2}=\frac{13}{20}

\frac{10}{40} =\frac{10/10}{40/10} =\frac{1}{4}

40 - 1 = 39

\frac{4}{39}

\frac{1}{4} × \frac{4}{39}

\frac{1}{39}

4 0
3 years ago
Evaluate the series 2 + 8 + 32 + 128 + 512 + 2048.
Sauron [17]
The answer is C) 2730
7 0
4 years ago
HURRY!!!:) Find the sum of (7x+4) and the opposite of 7x.
jeka57 [31]

Answer:

  • 4

Step-by-step explanation:

<u>Sum of (7x+4) and the opposite of 7x:</u>

  • 7x + 4 + (-7x) =
  • 7x + 4 - 7x =
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7 0
3 years ago
Since the area under the normal curve within two standard deviations of the mean is 0.95, the area under the normal curve that c
alukav5142 [94]

Answer:

X \sim N (\mu ,\sigma)

And for this case we know this condition:

P(\mu-2\sigma

By the complement rule we know that:

P(X< \mu -2\sigma \cup X>\mu +2\sigma) = 1-0.95=0.05

But since the distribution is symmetrical we know that:

P(X\mu +2\sigma) = 0.025

So then the statement for this case is FALSE.

b. False

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution to the problem

For this case if we define the random variable of interest X and we know that this random variable follows a normal distribution:

X \sim N (\mu ,\sigma)

And for this case we know this condition:

P(\mu-2\sigma

By the complement rule we know that:

P(X< \mu -2\sigma \cup X>\mu +2\sigma) = 1-0.95=0.05

But since the distribution is symmetrical we know that:

P(X\mu +2\sigma) = 0.025

So then the statement for this case is FALSE.

b. False

5 0
4 years ago
Middle school math...
insens350 [35]

Answer:

kole answer is 20

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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