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Lana71 [14]
3 years ago
15

title="(5 + \sqrt{4}) (5 - \sqrt{4} )" alt="(5 + \sqrt{4}) (5 - \sqrt{4} )" align="absmiddle" class="latex-formula">
IT IS RATIONAL OR IRRATIONAL? EXPLAIN WHY?​
Mathematics
1 answer:
Paha777 [63]3 years ago
4 0

Answer:

Rational

Step-by-step explanation:

Simplifying;

=(5+\sqrt{4} )(5-\sqrt{4} )\\\\=5(5-\sqrt{4} )+\sqrt{4} (5-\sqrt{4} )\\\\=25-5\sqrt{4}+ 5\sqrt{4}-4\\\\=25-4\\\\=21

On simplifying the expression we get 21. And 21 is is a rational number because on converting into p/q form we get 21/1. Here both 21 and 1 are rational number. So given expression is rational.

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Which expression represents the difference of (5x-3y) and (8x+8y)?
artcher [175]

Given:

The expressions are:

(5x-3y) and (8x+8y)

To find:

The difference of (5x-3y) and (8x+8y).

Solution:

Difference of (5x-3y) and (8x+8y) is written as:

Difference=(5x-3y)-(8x+8y)

On simplification, we get

Difference=5x-3y-8x-8y

Difference=(5x-8x)+(-3y-8y)

Difference=-3x-11y

Therefore, the difference of (5x-3y) and (8x+8y) is -3x-11y.

6 0
3 years ago
Score for Question 3: ___ of 5 points)
Olenka [21]

Answer:

(a)6 Equilateral Triangles.

(b)30-60-90 triangle.

(c)See Attached Triangle in Figure 2

(d)Length of the short leg = 2cm.

(e)Length of the hypotenuse= 4cm.

(f)Length of the long leg=2\sqrt{3}cm

(g)Apothem.

(h)Height of the Equilateral triangle=2\sqrt{3}cm

(i)Area of One Equilateral triangle =4\sqrt{3}cm^2

(j)Area of Hexagon ==24\sqrt{3}\:cm^2

Step-by-step explanation:

(a)From Figure 1, there are 6 Equilateral Triangles.

(b)If we cut an equilateral down the middle (green line), we create a 30-60-90 triangle.

(c)Triangle Attached in Figure 2.

(d)The length of the short leg of one of the 30-60-90 triangle is 2cm.

(e)The length of the hypotenuse of one of the 30-60-90 triangle is 4cm.

(f)Length of the long leg

We use Pythagoras Theorem to find the length of the long leg of the right triangle.

4^2=2^2+l^2\\l^2=4^2-2^2=12\\l=\sqrt{12}=2\sqrt{3}cm

(g)The vocabulary word for the long side of the 30-60-90 called in the polygon (green line) is Apothem.

It is line segment from the <u>center to the midpoint of one of the sides of a polygon.</u>

<u>(h</u>)Height of the Equilateral Triangle=2\sqrt{3}cm

(i)Area of One Equilateral triangle

Base =4 cm, Height =2\sqrt{3}cm

Area=0.5X4X2\sqrt{3}cm

=4\sqrt{3}\:cm^2

(j)Area of Hexagon =Area of One Equilateral Triangle X 6

=6X 4\sqrt{3}\\=24\sqrt{3}\:cm^2

6 0
3 years ago
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