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nekit [7.7K]
3 years ago
5

To add 20.4 + 3.75 + 4.25, Crystal first added 3.75 and 4.25. Which property did Crystal use to add mentally?

Mathematics
1 answer:
evablogger [386]3 years ago
3 0

Answer:

Associative Property of Addition

Step-by-step explanation:

From the list of given options, option A correctly answers the question and this is because

a + b + c = a + (b + c) --- (1)

or

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

<em>The above illustrations only apply to Associative Property of Addition</em>

In Crystal's case:

20.4 + 3.75 + 4.25 = 20.4 + (3.75 + 4.25)

This can be compared to (1) above

Hence;

<em>Option A answers the question</em>

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Answer:

When we have a rational function like:

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So the first step is to find the values of x such that the denominator (x^2 + 3) is equal to zero.

Then we need to solve:

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This is the square root of a negative number, then this is a complex number.

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D: x ∈ R.

b) we want to find two different numbers x such that:

r(x) = 1/4

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\frac{1}{4} = \frac{x + 1}{x^2 + 3}

We can multiply both sides by (x^2 + 3)

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x = \frac{-b +- \sqrt{b^2 - 4*a*c} }{2*a}

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x = \frac{-(-4) +- \sqrt{(-4)^2 - 4*1*(-1)} }{2*(1)} = \frac{4 +- 4.47}{2}

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2 years ago
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