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3 years ago

Please I really need help my grade depends on it

Mathematics

2 answers:

Marina86 [1]3 years ago

7 0

24 because the equation says greater than or equal to 24, but greater than 2.

DochEvi [55]3 years ago

5 0

Answer:

Step-by-step explanation:

Given the solution

2 < x ≤ 24

The ≤ symbol means less than or equal to

Thus x can equal 24

At the other end 2 < x which means x cannot equal 2

Thus x = 24 will make the inequality true

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A 95% confidence interval for a population mean is computed from a sample of size 400. Another 95% confidence interval will be c

Anna [14]

Answer:

The interval from the sample of size 400 will be approximately <u>One -half as wide</u> as the interval from the sample of size 100

Step-by-step explanation:

From the question we are told the confidence level is 95% , hence the level of significance is

$\alpha = (100 - 95 ) \%$

=> $\alpha = 0.05$

Generally from the normal distribution table the critical value of $\frac{\alpha }{2}$ is

$Z_{\frac{\alpha }{2} } = 1.96$

Generally the 95% confidence interval is dependent on the value of the margin of error at a constant sample mean or sample proportion

Generally the margin of error is mathematically represented as

$E = Z_{\frac{\alpha }{2} } * \frac{\sigma}{\sqrt{n} }$

Here assume that $Z_{\frac{\alpha }{2} } \ and \ \sigma \$ is constant so

$E = \frac{k}{\sqrt{n} }$

=> $E \sqrt{n} = K$

=> $E_1 \sqrt{n}_1 = E_2 \sqrt{n}_2$

So let $n_1 = 400$ and $n_2 = 100$

=> $E_1 \sqrt{400} = E_2 \sqrt{100}$

=> $E_1 = \frac{\sqrt{100} }{\sqrt{400} } E_2$

=> $E_1 = \frac{1}{2 } E_2$

So From this we see that the confidence interval for a sample size of 400 will be half that with a sample size of 100

7 0

2 years ago

Fiona wrote out the description of each step for her multiplication of the binomial and trinomial (2x – 3)(5x2 – 2x + 7).

Valentin [98]

Answer:

Step 2

Step-by-step explanation:

Fiona did mistake step 2.

Use the distributive property to multiply -3 times each term in the trinomial.

The correct result is

-3(5x^2 - 2x + 7) = -15x^2 + 6x - 21

Fiona written -6x instead of + 6x.

That's the error.

The answer is "Step 2"

Hope you will understand the concept.

Thank you.

5 0

3 years ago

Read 2 more answers

Karen has calls has 500 or 900 yards of thick soft wool, she has 200 feet at the strore they have 500 feet of wool. How many bal

Flauer [41]

Answer:

Yes.

Step-by-step explanation:

Because yes.

5 0

3 years ago

Distribute and simplify these radicals. I need help!

notka56 [123]

Answer:

The last one (4 sqare root 3)

Step-by-step explanation:

The square root of 16 is 4 so then it would be 4 sqroot 3

3 0

2 years ago

Read 2 more answers

 They spent $18 on tickets to the carnival and $36 on food.  They spent the rest of the money on g They spent $18 on tickets

Reptile [31]

Answer:

93 = g + 36 + 18

Step-by-step explanation:

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3 years ago