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Nikolay [14]
3 years ago
11

Y is inversly proportional to x^3 y=28 when x=a work out the value of y when x=2a

Mathematics
1 answer:
sveta [45]3 years ago
8 0

Answer:

<h2>y = 7/2</h2>

Step-by-step explanation:

The above statement is written as

y =  \frac{k}{  {x}^{3} }

where k is constant of variation

y = 28 x = a

28 =  \frac{k}{ {a}^{3} }  \\   \\ k = 28 {a}^{3}

The formula for the variation is

y =  \frac{28 {a}^{3} }{ {x}^{3} }

when x = 2a

y is

y =  \frac{28 {a}^{3} }{( {2a)}^{3} }  \\ y =   \frac{ {28a}^{3} }{ {8a}^{3} }  \\  \\ y =  \frac{28}{8}  \\  \\ y =  \frac{7}{2}

Hope this helps you

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Please help idk thisssss
Alekssandra [29.7K]
ANSWER
0.073 \% = 0.00073


EXPLANATION

Recall that,

\% =  \frac{1}{100}


That is why
100\%
is equivalent to
1.





This implies that,


0.073\% = 0.073 \times  \frac{1}{100}






This is the same as,


0.073\% = \frac{0.073}{100}


When we are dividing by
100
we move the decimal point backwards two times.


This implies that,

0.073\% = 0.00073


6 0
3 years ago
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The half of the circle equals 764747575674 cm. <br> What's the whole circle?
Greeley [361]
Times by 2
1.529495e9 cm
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3 years ago
7x - 4 = 24<br> show your work
Debora [2.8K]
Move -4 to the other side
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4 0
3 years ago
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major each of the following angles write it measures right weather it is acute ,obtuse, right angle A straight angle or a reflex
Leya [2.2K]

Answer:

i = right angle

ii = obtuse angle

iii = straight angle

iv = obtuse angle

v = acute angle

Step-by-step explanation:

an acute angle is an angle less than 90 degrees

an obtuse angle is an angle more than 90 degrees

a right angle is an angle equivalent to 90 degrees (looks like two straight lines perpendicular)

a straight angle is an angle equivalent to 180 degrees (looks like a straight line)

a reflex angle is an angle greater than 180 degrees

so, ...

i = right angle

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2 years ago
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Gala2k [10]
If you're factoring, your answer is

(4x - 3)(4x + 5)

You'll work it out this way:

16x^2 + 8x - 15

Since there's no GCF here, you multiply the first and third terms, giving you -240. Your next step is to find two numbers that have a sum of 8 and a product of -240. These numbers are 20 and -12. Plug those in and you've got:

16x^2 + 20x - 12x - 15

From here you divide it into two binomials. These are (16x^2 + 20x) and (-12x - 15).
When you take out the greatest common factors (4x and -3), they become:

4x(4x + 5) - 3(4x + 5)

Then you group what's outside of the parentheses together (4x - 3)
And bring what's inside of the parentheses down (4x + 5).
This brings your answer to

(4x - 3)(4x + 5)
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