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weqwewe [10]
3 years ago
13

Factorise using suitable identities (0.1x-0.2y)^2

Mathematics
1 answer:
Sav [38]3 years ago
3 0

Answer:

Step-by-step explanation:

(a - b)² = a² - 2ab + b²

a = 0.1x

b = 0.2y

(0.1x - 0.2y)²= (0.1x)² - 2*0.1x*0.2y + (0.2y)²

                   = (0.1)²x² - 0.04xy + (0.2)²y²

                   = 0.01x² - 0.04xy + 0.04y²

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If y is inversely proportional to the square root of x and y=−70 when x=49, find y if x=2401.
Dahasolnce [82]

The value of y when x= 2401 is -10

<h3>How to determine the value of x?</h3>

An inverse variation is represented as:

y = \frac{k}{\sqrt x}

Where k is the proportionality constant

When y = -70, x = 49

So, we have:

-70 = \frac{k}{\sqrt {49}}

Take the square root of 49

-70 = \frac{k}{7}

Multiply through by 7

k = -490

Substitute k = -490 in y = \frac{k}{\sqrt x}

y = -\frac{490}{\sqrt x}

When x =2401, we have

y = -\frac{490}{\sqrt {2401}}

Evaluate the square root

y = -\frac{490}{49}

Divide

y = -10

Hence, the value of y when x= 2401 is -10

Read more about variation at:

brainly.com/question/14254277

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4 0
2 years ago
Simplify x + 4 + 3x
Ostrovityanka [42]
X+4+3x =
4x+4 (you sum the like terms )
3 0
3 years ago
Read 2 more answers
Which is a counterexample of the following conjecture: "If two angles are supplementary, they have the same measure?"
Marrrta [24]

Answer:i dont know but i think its D.

Step-by-step explanation:

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4 0
3 years ago
Y=2x-4<br> What are the five ordered pairs
yarga [219]

Answer:

y= 2x+9

y=2x-1

y=2x-13

y=2x-2

y=2x+7

6 0
2 years ago
Plz help! What is the surface area of the figure?​
dexar [7]

Answer:

483 ft²

Step-by-step explanation:

2(7x7)=   98

3(5x12)=180

2(12x5)=120

2(5x5)=   50  

1(7x5) =  <u> 35   </u>

              483

               

6 0
3 years ago
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