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3 years ago

I need help understanding problem number 2

Mathematics

1 answer:

HACTEHA [7]3 years ago

6 0

Step-by-step explanation:

(2×2) . 2×2×2×2 . 2×2×2

=(4) . 16 . 8

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What is the sum of 2 + 0.42 + 1.8?

Inessa [10]

The answer is a, you add the numbers up get 4.22 which is equivalent to 4 whole aka ones and since .22 is a decimal you use your tenths and hundredths

4 0

3 years ago

Anybody help me to solve this question.

Mumz [18]

Answer:

$\dfrac{1}{(b-c)},\dfrac{1}{(c-a)} ,\dfrac{1}{(a-b)} are\ in\ AP$

Step-by-step explanation:

Given that $(b-c)^2, (c-a)^2 , (a-b)^2$ are in AP

To prove: $\dfrac{1}{(b-c)},\dfrac{1}{(c-a)} ,\dfrac{1}{(a-b)}$ are in AP

From given as we know if p , q, r are in AP then 2q= p+r.

$2(c-a)^2= (b-c)^2+(a-b)^2\\\\\Rightarrow 2(c^2+a^2-2ac)=b^2+c^2-2bc+a^2+b^2-2ab\\\\\Rightarrow 2c^2+2a^2-4ac= 2b^2+c^2+a^2 -2bc-2ab\\\\\Rightarrow a^2+c^2-2b^2-4ac= -2bc-2ab\\\\\Rightarrow a^2-2b^2+c^2= 4ac-2bc-2ab$

Now

$\dfrac{1}{(b-c)},\dfrac{1}{(c-a)} ,\dfrac{1}{(a-b)}2\dfrac{1}{(c-a)} =\dfrac{1}{(b-c)}+\dfrac{1}{(a-b)}\\\\\Rightarrow \dfrac{2}{(c-a)}= \dfrac{a-b+b-c}{(b-c)(a-b)} \\\\\Rightarrow \dfrac{2}{(c-a)}= \dfrac{a-c}{(b-c)(a-b)} \\\\\Rightarrow2(b-c)(a-b) = (c-a)(a-c) \\\\\Rightarrow 2(ab-b^2-ac+bc)= -(a-c)^2\\\\\Rightarrow 2ab- 2b^2-2ac+2bc = -a^2-c^2+2ac\\\\\Rightarrow a^2-2b^2+c^2=4ac-2ab-2bc$

Which is the result of AP

Hence proved

6 0

3 years ago

ArbitrLikvidat [17]

Answer:

18 girls

Step-by-step explanation:

6:9

6+9 = 15

we multiply each part of the ratio by 3

6*3 = 18 girls

9*3 = 27 boys

6 0

3 years ago

Please help me please help me

Pachacha [2.7K]

Answer:

C=66, C=25 1/7

Step-by-step explanation:

C=pi(d)

C=22/7*21

C=66

C=pi(d)

C=22/7*16

C=25 1/7

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3 years ago

The perimeter of the parallelogram is 62 cm.

Marina86 [1]

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8 0

2 years ago

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