3 years ago

gordon was thinking of a number. gordon subtracts 11 from it and gets an answer of 30.4, what was the original number?

Mathematics

1 answer:

victus00 [196]3 years ago

3 0

Answer:

41.4 is the answer

Step-by-step explanation:

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If (x + y)^2 = 105 and x^2 + y^2 = 65, what is the value of xy?

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$\boxed { \boxed {(a + b)^2 = a^2 + 2ab + b^2}}$

$(x + y) ^2 = 105$

$x^2 + 2xy + y^2 = 105$

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$\text{Given that } x^2 + y^2 = 65,$

$65 + 2xy = 105$

$2xy = 105 - 65$

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$xy = 20$

$\boxed { \boxed {\text{Answer: xy = 20}}}$

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