3 years ago

What is the least common denominator of 1/2 and 7/9

Mathematics

2 answers:

Ira Lisetskai [31]3 years ago

8 0

18 would be the correct answer

kaheart [24]3 years ago

4 0

Answer:

Step-by-step explanation:

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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)

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

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Karen is trying to decide which home phone company to use. Phone Home was a monthly charge of

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Answer:

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Step-by-step explanation:

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Convert the following equation into standard form. y = -5x + 2 5x + [?]y = [ ]

antiseptic1488 [7]

Answer:

standard form is Ax + by + c = 0

Step-by-step explanation:

add 5x to each side to get 5x + y - 2 = 0

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This looks like a second half of a question. are you sure this is the full question?

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Step-by-step explanation:

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