2 years ago

My sister is half my age when I was 6 now im 70 how old is she?

Mathematics

1 answer:

TEA [102]2 years ago

5 0

Answer:

your sister would be 35

Step-by-step explanation:

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TIMED QUESTION NEED HELP FASTWhat values of b satisfy 3(2b + 3)2 = 36?

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$\frac{-3+ 2\sqrt{3}}{2}\textrm{ and }\frac{-3- 2\sqrt{3}}{2}$

Step-by-step explanation:

$3(2b+3)^{2}=36\\\frac{3(2b+3)^{2}}{3}=\frac{36}{3}\\(2b+3)^{2}=12$

Taking square root both sides, we get

$\sqrt{(2b+3)^{2}}=\pm \sqrt{12}\\2b+3=\pm \sqrt{4\times 3}\\2b+3=\pm 2\sqrt{3}\\2b+3-3=\pm 2\sqrt{3}-3\\2b=-3\pm 2\sqrt{3}\\b=\frac{-3\pm 2\sqrt{3}}{2}\\b=\frac{-3+ 2\sqrt{3}}{2}\textrm{ or }b=\frac{-3- 2\sqrt{3}}{2}$

Therefore, the values of $b$ are:

$\frac{-3+ 2\sqrt{3}}{2}\textrm{ and }\frac{-3- 2\sqrt{3}}{2}$

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My sister is half my age when I was 6 now im 70 how old is she?​

My sister is half my age when I was 6 now im 70 how old is she?