Question 1079225
{{{A=u*C}}}
{{{B=v*C}}}
where u and v are constants.
So then,
{{{A+B=u*C+v*C=C(u+v)}}}
Directly proportional to C.

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{{{A+B=u*C-v*C=C(u-v)}}}
Directly proportional to C.

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{{{sqrt(AB)=sqrt(u*C*v*C)=sqrt(uv*C^2)=sqrt(uv)*C}}}
Directly proportional to C.