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3 years ago

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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The answer is 45

Step-by-step explanation:

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Hi!

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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:

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

Once $\sqrt{-1}=i$

$x=\pm5i$

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)

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3 years ago