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2 years ago

Which expression is equal to p + (q + r)?

Mathematics

1 answer:

Svetradugi [14.3K]2 years ago

3 0

Answer:

(p + q) + r

is the correct answer

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I would like some help,, no need to rush though! (20 points :])

Pepsi [2]

1. A

2. B

3. A

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3 years ago

How many sides does a heptagon have

BARSIC [14]

A heptagon is a polygon.

It has 7 sides

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3 years ago

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Is the sqrt of 102 a rational or irrational number?

lesantik [10]

Answer:

Yes, 102 isn't a square number (1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144) so the square root of 102 will keept going forever and is irrational.

Step-by-step explanation:

basically

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3 years ago

Solve for x.

Ivahew [28]

ANSWER

$x=\frac{2-\sqrt{10}} {3}$

or

$x=\frac{\sqrt{10}+2} {3}$

We have

$3x^2-4x-2=0$

Since we cannot factor easily, we complete the square.

Adding 2 to both sides give,

$3x^2-4x=2$

Dividing through by 3 gives

$x^2-\frac{4}{3}x= \frac{2}{3}$

Adding $(-\frac{2}{3})^2$ to both sides gives

$x^2-\frac{4}{3}x+(-\frac{2}{3})^2= \frac{2}{3}+(-\frac{2}{3})^2$

The expression on the Left Hand side is a perfect square.

$(x-\frac{2}{3})^2= \frac{2}{3}+\frac{4}{9}$

$\Rightarrow (x-\frac{2}{3})^2= \frac{10}{9}$

$\Rightarrow (x-\frac{2}{3})=\pm \sqrt{\frac{10}{9}}$

$\Rightarrow (x)=\frac{2}{3} \pm {\frac{\sqrt{10}}{3}$

Splitting the plus or minus sign gives

$x=\frac{2- \sqrt{10}} {3}$

or

$x=\frac{\sqrt{10}+2} {3}$

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3 years ago

Read 2 more answers

Can someone please help me please?

Iteru [2.4K]

Answer: D

Step-by-step explanation:

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3 years ago