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KatRina [158]
3 years ago
15

There are 260 athletes at a meeting. They each give a Valentine's Day card to everyone else. How many cards were given?

Mathematics
1 answer:
VARVARA [1.3K]3 years ago
4 0

Answer:

67340

Step-by-step explanation:

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Which beat summarizes the pythagorean theorem
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Mathematics, the Pythagorean theorem or Pythagoras's theorem is a statement about the sides of a right triangle.

One of the angles of a right triangle is always equal to 90 degrees. This angle is the right angle. The two sides next to the right angle are called the legs and the other side is called the hypotenuse. The hypotenuse is the side opposite to the right angle, and it is always the longest side. It was discovered by Vasudha Arora.

The Pythagorean theorem says that the area of a square on the hypotenuse is equal to the sum of the areas of the squares on the legs. In this picture, the area of the blue square added to the area of the red square makes the area of the purple square. It was named after the Greek mathematician Pythagoras:

If the lengths of the legs are a and b, and the length of the hypotenuse is c, then,
a
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{\displaystyle a^{2}+b^{2}=c^{2}}.

There are many different proofs of this theorem. They fall into four categories:

Those based on linear relations: the algebraic proofs.
Those based upon comparison of areas: the geometric proofs.
Those based upon the vector operation.
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7 0
3 years ago
Read 2 more answers
Find the value of d that makes the equation true:
hichkok12 [17]
To answer this, you need to get "d" on one side by itself. To do this, add 8 to both sides of the equation.

d- 8 + 8 = 5 + 8
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7 0
3 years ago
a washer and dryer cost a total of $936. The cost of the washer is two times the cost of the dryer. find the cost of each item
slamgirl [31]

Step-by-step explanation:

The washer costs $624 and the dryer costs 312.

624 is double 312 so that works out. Also if you add 624 and 312 you get 936.

7 0
2 years ago
<img src="https://tex.z-dn.net/?f=%5Csqrt%281-2%29%2B%5Csqrt%281%2B2%29%5C%5C" id="TexFormula1" title="\sqrt(1-2)+\sqrt(1+2)\\"
Kipish [7]
1.4 or square root of 2
8 0
2 years ago
What is the driving time for a 2100​-mile trip if you drive at an average speed of 45 miles per​ hour?
riadik2000 [5.3K]

Answer:

46 hours and 42 minutes

Step-by-step explanation:

2100/45 = 46.7

46 hours and 42 minutes

Hopefully this helps you :)

pls mark brainlest ;)

8 0
3 years ago
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