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zysi [14]
3 years ago
8

Which conic section does the equation below describe? x^2+y^2+2x-8y-13=0

Mathematics
1 answer:
Gre4nikov [31]3 years ago
3 0

Answer:  B) Circle

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

First, complete the square:

x² + 2x + <u>  1   </u>  + y² - 8y + <u>  16  </u> = 13 + <u>  1  </u> + <u>  16  </u>

       ↓       ↑             ↓         ↑

   (2/2) = (1)²          (-8/2) = (-4)²

       (x + 1)²    +             (y - 4)²   =  30

The result is a circle whose center is (-1, 4) and radius is √30

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timurjin [86]
Q1. The answer is <span>1 over 5 to the 3rd power.

</span>5 to the 5th is 5⁵
5 to the 8th is 5⁸
5 to the 5th over 5 to the 8th is \frac{ 5^{5} }{ 5^{8} }
To simplify, we will use two rules: 
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Therefore:
\frac{ 5^{5} }{ 5^{8} } = 5^{5-8} =5^{-3}= \frac{1}{5^{3}}
\frac{1}{5^{3}} is the same as 1 over 5 to the 3rd power.


Q2. The answer is <span>(53)−4.

The exponents are multiplied when are expressed in the form:
</span>(x^{a}) ^{b}= x^{a*b}
So, (5^{3} )^{-4}=5^{3*(-4)}=5^{-12}

Other choices are incorrect:
<span>one third to the 4th times one third to the 7th is </span>( \frac{1}{3} )^{4} *( \frac{1}{3} )^{7}=( \frac{1}{3} )^{4+7}
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Abigail earned $10.26 for babysitting her cousin for 3 hours. How much did she earn in each hour?
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Divide total earned by number of hours:

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kumpel [21]
Let
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we know that
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12²=144

then
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then
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case b) <span>√121 
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case c) <span>√136
</span>if x=√136
then
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case d) <span>√150
</span>if x=√150
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the answer is
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the first equation is equal to the second equation so

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divide both sides by -3

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now, use the value of x to find the value of y like this:

y=2x+3 (x=4)

y=2(4)+3

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y=11

therefore, the two lines intersect at the point (4,11)

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