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r-ruslan [8.4K]
2 years ago
15

What percent is equivalent to

Mathematics
1 answer:
Soloha48 [4]2 years ago
8 0

Answer:

20%

Step-by-step explanation:

To change a fraction to a percentage , multiply by 100%

\frac{8}{40} × 100%

= 0.2 × 100%

= 20%

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Answer:

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Step-by-step explanation:

The standard form of a quadratic equation is

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The quadratic formula is

x = \dfrac{-b \pm \sqrt{b^2 - 4ac}}{2a}

Where the formula has -b, the problem has -2, so b = 2.

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Let's look at choice A.

x^2 + 1 = 2x - 3

Subtract 2x from both sides. Add 3 to both sides.

x^2 - 2x + 4 = 0   <em>This is not it!</em>

Let's look at choice B.

x^2 - 2x - 1 = 3

Subtract 3 from both sides.

x^2 - 2x - 4 = 0     <em>This is not it!</em>

Let's look at choice C.

x^2 + 2x - 1 = 3

Subtract 3 from both sides.

x^2 + 2x - 4 = 0     <em>This is it!</em>

Answer: C. x^2 + 2x - 1 = 3

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