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Helen [10]
3 years ago
15

Which expression represents the algebraic phrase “negative 3.9 less than one third of a number”?

Mathematics
2 answers:
Aleksandr-060686 [28]3 years ago
6 0
Start Fraction n over 3 End Fraction minus (negative 3.9)
Minchanka [31]3 years ago
5 0

Answer:

n over 3 End Fraction minus (negative 3.9)

Step-by-step explanation:

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The following figure is made of six semicircles with the same diameter, and of four congruent equilateral triangles represented
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6 semicircles = 3 circles

The formula of the area of a equilateral triangle:

A_\triangle=\dfrac{a^2\sqrt3}{4}

We have a = |AE| = 3cm. Substitute:

A_\triangle=\dfrac{3^2\sqrt3}{4}=\dfrac{9\sqrt3}{4}\ cm^2

The formula of the area of a circle:

A_O=\pi r^2

We have 2r = |AE| =3cm → r = 1.5cm. Substitute:

A_O=\pi\cdot1.5^2=2.25\pi\ cm^2

The area of the figure:

A=4A_\triangle+3A_O\\\\A=4\cdot\dfrac{9\sqrt3}{4}+3\cdot2.25\pi=9\sqrt3+6.75\pi=6\dfrac{3}{4}\pi+9\sqrt3\\\\=\dfrac{27}{4}\pi+\dfrac{36\sqrt3}{4}=\dfrac{9}{4}\cdot3\pi+\dfrac{9}{4}\cdot4\sqrt3=\dfrac{9}{4}(3\pi+4\sqrt3)\ cm^2

7 0
3 years ago
Eden has a doctoral degree based on the bar chart below how well her employment opportunities change Mum❤️Eden has a doctoral de
lidiya [134]

Answer: they will increase by 17%

Step-by-step explanation: apex

7 0
3 years ago
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lapo4ka [179]

Answer:

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Step-by-step explanation:

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Hope this helps you! :)

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Answer:

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Step-by-step explanation:

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