2 years ago

Y is inversibly prportional to x when y=7 x=9 work out the value when x=21

Mathematics

1 answer:

Natasha2012 [34]2 years ago

3 0

Answer: a) Equation become xy=1 and the second part answer is b) y=1/21

Step-by-step explanation:

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Find the sum of 46 + 42 + 38 + ... + (-446) + (-450)46+42+38+...+(−446)+(−450)

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sum of sequence Find the sum of 46 + 42 + 38 + ... + (-446) + (-450) is -25,250

Step-by-step explanation:

We need to find sum of sequence : 46 + 42 + 38 + ... + (-446) + (-450)

Given sequence is an AP with following parameters as :

$a=46\\d=42-46=-4$

So , Let's calculate how many terms are there as :

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⇒ $-496=(n-1)(-4)$

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⇒ $124=n-1$

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⇒ $S_1_2_5 = \frac{125}{2}(2(46)+(125-1)(-4))$

⇒ $S_1_2_5 = \frac{125}{2}(-404)$

⇒ $S_1_2_5 =-25,250$

Therefore , sum of sequence Find the sum of 46 + 42 + 38 + ... + (-446) + (-450) is -25,250

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3 years ago

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3 years ago

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Y is inversibly prportional to x when y=7 x=9 work out the value when x=21​

Y is inversibly prportional to x when y=7 x=9 work out the value when x=21