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3 years ago

How can this fact family model help us compare the

Mathematics

1 answer:

arlik [135]3 years ago

4 0

Answer:

The sum of 3 and 7 is - 10
10 is - bigger than 7
7 - bigger than 3

Step-by-step explanation:

Hope it helps.

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Add the sum and difference identities for sin x to derive 1/2 [sin(x+y)+sin(x-y)]=sin x cos y

Solnce55 [7]

Answer:

true

Step-by-step explanation:

1/2 (sin(x+y)+sin(x-y))

= 1/2 (sin x cos Y + cos x sin y + sin x cos y - cos x sin y)

= 1/2 * 2 sin x cos y

= sin x cos y

The expression is true.

3 0

3 years ago

A random sample of 56 lithium batteries has a mean life of 645 hours with a population standard deviation of 31 hours. Compute t

bearhunter [10]

Answer: A. (636.9, 653.1)

Step-by-step explanation:

Given : Sample size : n=56

Significance level : $\alpha: 1-0.95=0.05$

Critical value : $z_{0.05}=1.96$

Sample mean : $\overline{x}=645\text{ hours}$

Standard deviation : $\sigma= 31\text{ hours}$

The 95% confidence interval for population mean is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}\\\\=645\pm (1.96)\dfrac{31}{\sqrt{56}}\\\\=645\pm8.1\\\\=(636.9, 653.1)$

Hence, 95% confidence interval for population mean is (636.9, 653.1).

8 0

3 years ago

2x+1=2x-1 solve for x and show work plz

Kisachek [45]

Answer:

This is not an equation because both sides are not equal.

Step-by-step explanation:

2x+1=2x-1

+1 +1

2x+2=2x

-2x -2x

2=0

5 0

3 years ago

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I’ll mark brainliest if you help plsss

insens350 [35]

Answer:

1a. four minus n, four subtracted by n

1b. t over 5, t divided by five

1c. nine plus q, the sum of nine plus q

1d. three times h, h times three

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3 years ago

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Suppose that 3 PLS HELP NEED ANSWER

Mazyrski [523]

Answer:with?

Step-by-step explanation:

7 0

3 years ago