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Vikki [24]
3 years ago
15

PLZ HELP!!!!!!!!!!!!!!!!!!!! WILL MARK

Mathematics
1 answer:
mamaluj [8]3 years ago
7 0
The answer is number 3.
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Help help help!! Does anyone know number 1 and 2?
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54 x 2.5 = $135
The correct answer is $135

2. A^2 + 9^2 = 22^2
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Planet Krypton has 2 times the radius and 2 times the mass of the Earth. What is the best estimate for the magnitude of the grav
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a

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Find the value of c(5)<br>c(n)=10+2n​
Dahasolnce [82]

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3 0
2 years ago
Please help i dont understand what its asking
Arisa [49]

Multiply both the numerator and denominator by 2+\sqrt3, which is called the "conjugate" of 2-\sqrt3:

\dfrac{5+\sqrt3}{2-\sqrt3}\cdot\dfrac{2+\sqrt3}{2+\sqrt3}

Why do we pick this number? Recall the difference of squares factorization:

a^2-b^2=(a-b)(a+b)

Now replace a=2 and b=\sqrt3. Then

(2-\sqrt3)(2+\sqrt3)=2^2-(\sqrt3)^2=4-3=1

So in your fraction, you end up with

\dfrac{5+\sqrt3}{2-\sqrt3}=\dfrac{(5+\sqrt3)(2+\sqrt3)}1=(5+\sqrt3)(2+\sqrt3)

Finally, just expand the product.

(5+\sqrt3)(2+\sqrt3)=10+7\sqrt3+(\sqrt3)^2=\boxed{13+7\sqrt3}

7 0
3 years ago
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