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Brums [2.3K]
2 years ago
9

Write 400 in scientific notation.

Mathematics
1 answer:
OlgaM077 [116]2 years ago
3 0

= 4 × 10 to the power of 2

Step-by-step explanation:

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The perimeter of an equilateral triangle is 6n-15 . Write an expression to represent the length of each side.
jonny [76]

Answer:we know that all 3 sides are equal

so if side =a

then perimeter =3a

therefore

3a=6n-15

a=6n-15/3

a=2n-5

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Convert the following decimal to a fraction.
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2.The diagonals of a rhombus are in the ratio 5:12. If its perimeter is 104 CM, findthe lengths of the sides and the diagonals.​
coldgirl [10]

Answer:

Lenghts of the sides: 26\ cm

Lenghts of the diagonals: 48\ cm and 20\ cm

Step-by-step explanation:

Look at the rhombus ABCD shown attached, where AC and BD de diagonals of the rhombus.

The sides of a rhombus have equal lenght. Then, since the perimeter of this one is 104 centimeters, you can find the lenght of each side as following:

AB=BC=CD=DA=\frac{104\ cm}{4}= 26\ cm

You know that the diagonals are in the ratio 5:12

Then, let the diagonal AC be:

AC=12x

This means that AE is:

AE=\frac{12x}{2}=6x

And let the diagonal BD be:

BD=5x

So BE is:

BE=\frac{5x}{2}=2.5x

Since the diagonals of a rhombus are perpendicular to each other, four right triangles are formed, so you can use the Pythagorean Theorem:

a^2=b^2+c^2

Where "a" is the hypotenuse and "b" and "c" are the legs.

In this case, you can choose the triangle ABE. Then:

a=AB=26\\b=AE=6x\\c=BE=2.5x

Substituting values and solving for "x", you get:

26^2=(6x)^2+(2.5x)^2\\\\676=36x^2+6.25x^2\\\\\sqrt{\frac{676}{42.25}}=x\\\\x=4

Therefore, the lenghts of the diagonals are:

AC=12(4)\ cm=48\ cm

BD=5(4)\ cm=20\ cm

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3 years ago
The circumference of a circular garden is 94.2 feet. What is the radius of the garden? Use 3.14 for it and do not round your ans
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Answer:

Use 3.14 for p and do not round your answer. The circumference of a circular garden is 128.74 feet. What is the diameter of the garden? Use 3.14

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Which one of the following is a true statement about a circle inscribed in a regular polygon?
Setler [38]
I think that B is correct
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3 years ago
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