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vazorg [7]
3 years ago
8

Which of the following points lies on the circle whose center is at the origin and whose radius is 10?

Mathematics
1 answer:
Romashka-Z-Leto [24]3 years ago
6 0

The equation is: \frac{(x - 0)^{2} }{10^{2} } + \frac{(y - 0)^{2} }{10^{2} } = 1

= \frac{x^{2} }{10^{2} } + \frac{y^{2} }{10^{2} } = 1

A) \frac{(\sqrt{10}) ^{2} }{10^{2} } + \frac{(0)^{2} }{10^{2} } = 1

⇒ \frac{10}{100} + 0 = 1   FALSE

B) \frac{(0) ^{2} }{10^{2} } + \frac{(2\sqrt{5})^{2} }{10^{2} } = 1

⇒ 0 + \frac{20}{100} = 1   FALSE

C) \frac{(5\sqrt{2}) ^{2} }{10^{2} } + \frac{(5\sqrt{2})^{2} }{10^{2} } = 1

⇒ \frac{50}{100} + \frac{50}{100} = 1   TRUE

Answer: C


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30 ft²

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mixas84 [53]

Answer:

x=72

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Step-by-step explanation:

1st question. y=54 because it is a bisector of the 108 degree angles. (a polygon's interior angles add to number of sides minus 2 times 180)

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3 0
3 years ago
What is the solution of the system ? <br> 2x+3y=4 <br> x-y=-3
fgiga [73]
Change the equation, x - y = -3, to isolate x or y and plug that new equation into the equation 2x + 3y = 4

I changed it to: x = y - 3
so 
2(y - 3) + 3y = 4
2y - 6 + 3y = 4
5y - 6 = 4
5y = 4 + 6
5y = 10
y = 10/5
y = 2

then you plug that 2 into the equation x = y - 3 to get the value of x

x = (2) - 3
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you can check this by plugging the x and y values into the equation 2x + 3y = 4

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hope this helps :)




6 0
3 years ago
The president of a certain University receives a salary that is three times the salary of one of the department heads the total
Furkat [3]

<u>Answer:</u>

$142500

<u>Step-by-step explanation:</u>

We are given that the resident of a certain University receives a salary that is three times the salary of one of the department heads.

Assuming x to be the salary of the department head, if the total of the two salaries is $190000, we are to find the salary of the president of the University.

We can write an equation in terms of x:

3x+x=190000

4x=190000

x=47500

Salary of the president of the University = 3(47500) = $142500

5 0
3 years ago
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