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2 years ago

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,

Area=side^2

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

NOW we have to find the value of the side areas of this pyramid. 

As these parts are a triangle

Area of triangle=1/2×bh

where

b=base
h=height

so,Area=

1/2×(5)(6)

1/2×(30)

15 square inch.

But in this pyramid, it has 4 triangular sides.

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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Item a:

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

The parameters are:

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$\sigma$ is the standard deviation of the sample.

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Hence, the value of the test statistic is:

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

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

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

Item b:

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

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