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miskamm [114]
3 years ago
13

If someone can help with this tysm, in class rn tryna get an A

Mathematics
1 answer:
Rom4ik [11]3 years ago
6 0

Answer:

1. 4/9

2. 80,100,6.5

3.  10 and 11

4. 56cm

5. 3 an4

6. Real, Rational, Integer

7. All whole numbers are natural numbers

8. -1 1/2

9. √72

10. √9

Good luck :)

Step-by-step explanation:

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Answer:

The answer is 45

Step-by-step explanation:

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The answer is :
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That's 32.15 in expanded fraction.

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Answer:

462 sq in

Step-by-step explanation:

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3 years ago
Please help, and thank you!
lawyer [7]

Answer:

3. C

4. D

Step-by-step explanation:

3.

x^2+25=0\\x^2=-25\\x=\pm\sqrt{-25}

Once \sqrt{-1}=i

x=\pm5i

4.

A quadratic equation has no real roots when the discriminant (\Delta) is negative. \Delta.

Let's try all the equations:

(A)

2x^2-7x-9=0\\\\\Delta=\sqrt{\left(-7\right)^2-4\cdot \:2\left(-9\right)}\\\Delta=\sqrt{\left(-7\right)^2+4\cdot \:2\cdot \:9}\\\Delta=\sqrt{121} \\\Delta=11

(B)

2x^2=7x\\2x^2-7x=0\\x(2x-7)=0\\x=0\\\text{or}\\2x-7=0\\2x=7\\\\

$x=\frac{7}{2} $

(C)

2x^2+7x-9=0\\\Delta = \sqrt{7^2-4\cdot \:2\left(-9\right)}\\\Delta = \sqrt{7^2+4\cdot \:2\cdot \:9}\\\Delta = \sqrt{121} \\\Delta= 11

(D)

2x^2-7x+9=0\\\Delta = \sqrt{\left(-7\right)^2-4\cdot \:2\cdot \:9}\\\\\Delta=\sqrt{-23} \\\Delta=\sqrt{23i}

8 0
3 years ago
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