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KatRina [158]
3 years ago
14

Which expressions, when evaluated with y = –7, are positive in value?

Mathematics
1 answer:
Kruka [31]3 years ago
6 0
A) 18+(2*(-7)) = 4
B) (-3(-7))+(-17) = 4
C) (-2(-7))-23 = -9
D) -30-(4(-7)) = -2
So your answer is A and B
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Explanation:
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Given:  1/C + 1/m = 1/z ;  Solve for "m".

Subtract  "1/C" from each side of the equation:
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1/C + 1/m − 1/C = 1/z − 1/C  ;

to get:  1/m = 1/z − 1/C ;
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Now, multiply the ENTIRE EQUATION (both sides); by "(mzC"); to get ride of the fractions:
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mzC {1/m = 1/z − 1/C} ;

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Factor out an "m" on the "right-hand side" of the equation:

zC = m(C − z) ;  Divide EACH side of the equation by "(C − z)" ; to isolate "m" on one side of the equation;

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