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8 May 2019

Find the value of xy-yz-zx where x+y-z=4 and x^2+y^2+z^2=30

at May 08, 2019

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The coefficient of cubical expansion of mercury is 0.00018/C and that of brass 0.00006/C. If a barometer having a brass scale were to read 74.5 cm at 30C, Find the true barometer height at 0C. the Scale is supposed to be corrected at 15C.

ANSWER : 74.122 cm

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