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Semmy [17]
3 years ago
14

What are the subsets of the real number system that 0 belongs

Mathematics
2 answers:
Gnoma [55]3 years ago
8 0

Answer:

A natural number is a rational number. An irrational number is a real number. Zero is a natural number.

Step-by-step explanation:

⇵∝

STALIN [3.7K]3 years ago
3 0

Answer:

Whole numbers, integers, rational numbers, and real numbers

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The first term of an arithmetic sequence is -5, and the tenth term is 13. Find the common difference.
il63 [147K]

Answer:

2

Step-by-step explanation:

If the common difference is d we can write:

-5 + 9d = 13

9d = 18

d = 2

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3 years ago
Find the area of an equilateral triangle with apothem 7 cm. Round to the nearest whole number
Yuliya22 [10]
In <span>equilateral triangle all sides are equal =x,
from  right triangle that  is formed by </span>apothem , height 7*3= 21
hypotenuse /opposite leg = sin angle,
hypotenuse is a side of triangle =x, opposite leg is apotheme =21,
angle in equilateral triangle =60⁰
21/x= sin 60, x*sin60=21, x=21/sin60, x=21/(√3/2), x=42/√3
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Area of triangle =1/2 *42/√3*42/√3*sin 60=1/2*(42²/3)*(√3/2) ≈ 255 cm²



this is just second way to do this problem, that I did at first (either way is correct)
<span> apothem divides one side by half,
so we get small right triangle with sides x hypotenuse, x/2 is one leg , and 21 is another leg
</span>by Pythagorean theorem 
x²=(x/2)² +21²
x²-x²/4=441
3x²/4=441
3x²=441*4=1764
x²=1764/3
x=42/√3
Area of triangle =1/2*base *height =1/2*42/√3 *21≈255 cm²
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2 years ago
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The answer would be B) 7.41, 7.6,7 4/5.

Hope this helps!
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2 years ago
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