How do you write 6 3/5 as a decimal in simplest form?

What are the solutions to the equation 6x^2 - x - 40 = 0?

Aleks04 [339]

A
That’s the real answer

4 0

3 years ago

Find the length x It would help me so much thanks

sergij07 [2.7K]

Answer:

$x = 7$

Step-by-step explanation:

$\frac{x}{6} = \frac{3.5}{3}$

$3x = 21$

$x = 7$

7 0

3 years ago

Jane has a checkbook balance of $68.00. She then writes two checks one for $5.00 and one for $62.50. She also deposits $75.00 th

Sunny_sXe [5.5K]

The answer here would be <span>ON/C 6 8 – 5 – 6 2 . 5 0 + 7 5 =</span>

4 0

3 years ago

The method of tree ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population o

blondinia [14]

The value of mean, standard deviation and interval from the method of tree ring dating is 1273 AD, 37 years, [1250,1296].

According to the statement

we have to find that the standard deviation, mean and the intervals from the given data.

So, According to the given data from the method of tree ring dating

The value of mean is

x-bar = (1271 + 1208 + 1229 + 1299 + 1268 + 1316 + 1275 + 1317 + 1275) / 9 = x-bar = 1273 AD

And now we find standard deviation :

s = √∑(xi - x-bar) / (N - 1)

∑(xi - x-bar)^2 = (1271 - 1273)2 + (1208 - 1273)2 + (1229 - 1273)2 + ... + (1275 - 1273)2

∑(xi - x-bar)^2 = (-2)2 + (-65)2 + (-44)2 + ... + (2)2

∑(xi - x-bar)^2 = 4 + 4225 + 1936 + 676 + 25 + 1849 + 4 1936 + 4

∑(xi - x-bar)^2 = 10,659

Now,

s^2 = 10659/8 = 1332

s = 37 years

So, standard deviation is 37 years.

We need the t-distribution table since the standard deviation is unknown. Therefore, our degrees of freedom is 9 - 1 = 8 and the critical value is 1.860. Set up the confidence interval for the mean:

[x-bar ± t*(s/√n)] = [1273 ± 1.860*(37/√9)]

[x-bar ± t*(s/√n)] = [1250,1296]

So, The value of mean, standard deviation and interval from the method of tree ring dating is 1273 AD, 37 years, [1250,1296].

Learn more about method of tree ring dating here

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Question:

The method of tree ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution.

For more data please see the image below.

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