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ankoles [38]
2 years ago
5

ANSWER I WILL GIVE BRAINLIEST

Mathematics
2 answers:
____ [38]2 years ago
6 0

Answer:

  • \pmb{85~square~inches  }

Step-by-step explanation:

We have given that,this net can be folded to make a square pyramid.

we have to find the value of the surface area of this pyramid.

The surface area of this pyramid is the sum of all sides of it.

Atfirst the area of the bottom part,as it is a square,

<u>Area</u><u>=</u><u>side</u><u>^</u><u>2</u>

So,Area of the bottom. part=5^2=25 square inch.

<u>NOW</u><u> </u><u>we</u><u> </u><u>have to</u><u> </u><u>find the value of</u><u> </u><u>the</u><u> </u><u>side</u><u> </u><u>areas</u><u> </u><u>of</u><u> </u><u>this</u><u> </u><u>pyramid</u><u>. </u>

As these parts are a triangle

<u>Area</u><u> </u><u>of</u><u> </u><u>triangle</u><u>=</u><u>1</u><u>/</u><u>2</u><u>×</u><u>bh</u>

where

  • b=base
  • h=height

so,Area=

  • 1/2×(5)(6)

  • 1/2×(30)

  • 15 square inch.

<em>But</em><em> </em><em>in</em><em> </em><em>this</em><em> </em><em>pyramid</em><em>, </em><em>it</em><em> </em><em>has</em><em> </em><em>4</em><em> </em><em>triangular</em><em> </em><em>sides</em><em>.</em>

So,Area of all triangular side=4×15=60 square inch.

<h3>HENCE,</h3>

The surface area =60+25=85 square inch

Anna007 [38]2 years ago
5 0

Answer:

85 square inches

Step-by-step explanation:

The surface area is the area of all the sides and the bottom

The area of the bottom is

A = s^2  since it is a square

A = 5^2 = 25 in^2

The sides are triangles

A = 1/2 bh  where b is the base and h is the height

A = 1/2 ( 5)(6)

A = 15 in^2

We have 4 sides

The area of the 4 sides

4*15 = 60 in^2

Add the area of the side to the bottom

25+60 = 85 in^2

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lapo4ka [179]

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a)

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The p-value is of 0.0668.

The critical value is z^{\ast} = -1.28

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Item a:

At the null hypothesis, it is <u>tested if the mean is of 7.4 minutes</u>, that is:

H_0: \mu = 7.4

At the alternative hypothesis, it is <u>tested if the mean is lower than 7.4 minutes</u>, that is:

H_1: \mu < 7.4

We have the <u>standard deviation for the population</u>, hence, the z-distribution is used.

The test statistic is given by:

z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}

The parameters are:

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For this problem, the values of the <em>parameters </em>are: \overline{x} = 7.1, \mu = 7.4, \sigma = 1.2, n = 36.

Hence, the value of the <em>test statistic</em> is:

z = \frac{\overline{x} - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{7.1 - 7.4}{\frac{1.2}{\sqrt{36}}}

z = -1.5

Using a z-distribution calculator, the p-value is of 0.0668.

Also using a calculator, considering a <u>left-tailed test</u>, as we are testing if the mean is less than a value, the critical value with a <u>significance level of 0.1</u> is of z^{\ast} = -1.28.

Item b:

Since the <u>test statistic is less than the critical value</u> for the left-tailed test, there is enough evidence to conclude that the null hypothesis will be rejected.

You can learn more about the use of the z-distribution to test an hypothesis at brainly.com/question/16313918

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2 years ago
Grasshoppers are distributed at random in a large field according to a Poisson process with parameter a 5 2 per square yard. How
HACTEHA [7]

In this question, the Poisson distribution is used.

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In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

In which

x is the number of sucesses

e = 2.71828 is the Euler number

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This means that \mu = 5.2r, in which r is the radius.

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Another example of a Poisson distribution is found at brainly.com/question/24098004

3 0
3 years ago
Help asap plssss, brainliest!!
liubo4ka [24]

Answer:

85

Step-by-step explanation:

85+ 80 = 185

i dont think this is right tho

6 0
3 years ago
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Answer:

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