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Temka [501]
2 years ago
5

find the surface area a planet if its circumference is about 18,000 miles long. Round to the nearest thousand square miles

Mathematics
1 answer:
Furkat [3]2 years ago
7 0

The surface area of the planet is 103,184,713.4 miles².

<h3>What is the surface area?</h3>

A planet has the shape of a sphere.

The first step is to determine the radius of the planet from the circumference.

Radius = circumference / (π x 2)

18,000 / (3.14 x 2) = 2,866.24 miles

Surface area of a sphere = 4πr²

4 x 3.14 x ( 2,866.24²) = 103,184,713.4 miles²

To learn more about the surface area of a sphere, please check: brainly.com/question/27267844

#SPJ1

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3 years ago
What is constant of Proportionality in the equation y = 2.5x ?
Tpy6a [65]

Answer:

<em>2.5</em>

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A direct variation equation has the form y = kx, where k is the constant of proportionality.

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The way Maria calculates the final price of the book is correct. We know that the book normally sells for $26.50 plus a 10% sales tax. We also know that the students will receive an additional 25% discount. We must understand that the sales tax is applied to the discounted price. So first we will calculate 25% of 26.50 and subtract it from that amount. So the price will then be: (26.50 - 6.625). The price is now $18.34. Then to calculate the tax, it will be (10% * 18.34), so 1.834. We add this amount to the discounted price so: (18.34+1.834) = 20.12.


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