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3 years ago

I need help on 8 and 9 please

Mathematics

1 answer:

Olenka [21]3 years ago

4 0

Answer:

8. corresponding angles 9. b. 238

Step-by-step explanation:

corresponding angles because it holds the same relative position as the other angle

angle 8 is the same angle as angle 4 so take 119 multiply by 2 equals 238

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Here are some questions I'm confused about

Ann [662]

16. -0.65, -3/8, 5/16, and 2/4

18. -5/8, -0.6, -7/12, 0.72

20. -0.35, -0.3, 0.5, 0.55

Hope this helps!.

6 0

3 years ago

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Simplify. 4x2+2xx2+x−28x2+4x3x2+10x+8

Tatiana [17]

What’s the answer? I can’t divide anything if it’s just x. Example: 12x+24x+30 = 467. Then you can just divide the numbers after they are added up to see what x equals. 30 and 24x + 12x won’t go together because they have x, 30 doesn’t. Move your x’s to Texas.

3 0

3 years ago

Describe two methods for finding the sale price of an item that is discounted 30%. which method do you prefer? Explain.

Mekhanik [1.2K]

One can take the price of the item before the discount is applied and subtract that from the percentage off and get the cost of the item.

I find this is the most effective way.

another method could be if one turned the percentage into a decimal it could be subtracted from the cost of the item.

6 0

3 years ago

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The heights of 40 randomly chosen men are measured and found to follow a normal distribution. An average height of 175 cm is obt

AVprozaik [17]

Answer:

95% two-sided confidence interval for the true mean heights of men is [168.8 cm , 181.2 cm].

Step-by-step explanation:

We are given that the heights of 40 randomly chosen men are measured and found to follow a normal distribution.

An average height of 175 cm is obtained. The standard deviation of men's heights is 20 cm.

Firstly, the pivotal quantity for 95% confidence interval for the true mean is given by;

P.Q. = $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, $\bar X$ = sample average height = 175 cm

$\sigma$ = population standard deviation = 20 cm

n = sample of men = 40

Here for constructing 95% confidence interval we have used One-sample z test statistics as we know about population standard deviation.

So, 95% confidence interval for the true mean, $\mu$ is ;

P(-1.96 < N(0,1) < 1.96) = 0.95 {As the critical value of z at 2.5%

level of significance are -1.96 & 1.96}

P(-1.96 < $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ < 1.96) = 0.95

P( $-1.96 \times }{\frac{\sigma}{\sqrt{n} } }$ < ${\bar X-\mu}$ < $1.96 \times }{\frac{\sigma}{\sqrt{n} } }$ ) = 0.95

P( $\bar X-1.96 \times }{\frac{\sigma}{\sqrt{n} } }$ < $\mu$ < $\bar X+1.96 \times }{\frac{\sigma}{\sqrt{n} } }$ ) = 0.95

95% confidence interval for $\mu$ = [ $\bar X-1.96 \times }{\frac{\sigma}{\sqrt{n} } }$ , $\bar X+1.96 \times }{\frac{\sigma}{\sqrt{n} } }$ ]

= [ $175-1.96 \times }{\frac{20}{\sqrt{40} } }$ , $175+1.96 \times }{\frac{20}{\sqrt{40} } }$ ]

= [168.8 cm , 181.2 cm]

Therefore, 95% confidence interval for the true mean height of men is [168.8 cm , 181.2 cm].

The interpretation of the above interval is that we are 95% confident that the true mean height of men will be between 168.8 cm and 181.2 cm.

3 0

3 years ago

The radius of a circle is 9 1/4 mm. what is the circumference in terms of pi?

kirill [66]

The formula to find the circumference of a circle is C=2*pi*r.
Substitute 9 1/4 or 9.25 for r.
C=2*pi*r
C=2*pi*9.25
C=18.5pi
The circumference of the circle would be 18.5pi.

4 0

4 years ago

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