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natulia [17]
3 years ago
6

2x - 3 = - ( 4x + 9 )

Mathematics
1 answer:
mafiozo [28]3 years ago
3 0

2x-3 = -(4x+9)

2x-3 = -4x-9

2x+4x=3-9

6x=-6

x=-1

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Vertex A in quadrilateral ABCD lies at (-3, 2). If you rotate ABCD 180° clockwise about the origin, what will be the coordinates
natali 33 [55]

The rule for a rotation by 180° about the origin is (x,y) -->(−x,−y)

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Answer:

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Use the net as an aid to compute the surface area (rounded to the nearest integer) of the triangular pyramid with an equilateral
aleksandrvk [35]

Answer:

Correct answer is C)\ 254\ m^{2}

Step-by-step explanation:

As per the given diagram, we know the following details:

Height of the triangular pyramid is <em>14m</em>.

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Height of Triangular base = <em>8.7m</em>

Formula for <em>surface area of triangular pyramid</em>:

\text{Area = Area of Triangular base + 3 }\times\text{Area of side triangle}

(Triangular base is shown in the dotted lines in the question figure.

The other 3 triangles are the side triangles.)

We know that,

\text{Area of a triangle = }\dfrac{1}{2} \times \text{Base} \times \text{Height}

\Rightarrow \text{Required Surface Area = } \dfrac{1}{2} \times 8.7 \times 10 + 3 \times \dfrac{1}{2} \times 14 \times 10\\\Rightarrow \dfrac{1}{2}\times (87 + 3 \times 140)\\\Rightarrow \dfrac{1}{2}\times (87 + 420)\\\Rightarrow \dfrac{1}{2} \times 507\\$\approx$ 254 m^{2}

Hence correct answer is C)\ 254\ m^{2}.

3 0
3 years ago
How many kilograms of tin will be required to make 250 kg of an alloy, if the alloy must contain 81% copper, 14% tin and 5% lead
uysha [10]

Answer:

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Step-by-step explanation:

all are obeying a constant ratio

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5 0
2 years ago
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dexar [7]
He needs it 4 inches longer because 4 ft is 48 inches.
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cupoosta [38]

Answer:

The answer is 9 + 21b

Step-by-step explanation:

Simplify the expression.

~Hoped this helped~

4 0
3 years ago
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