lf \[A=10{{w}^{3}}+20{{w}^{2}}-55w+60,\] \[B=-\text{ }25{{w}^{2}}+15w-10\]and \[C=5{{w}^{2}}-10w+20,\] then \[A+B-C\]is equal to _____.

\[10{{w}^{3}}+10{{w}^{2}}+30w+30\]

\[10{{w}^{3}}+10{{w}^{2}}-30w+30\]

\[10{{w}^{3}}-10{{w}^{2}}-30w+30\]

lf \[A=10{{w}^{3}}+20{{w}^{2}}-55w+60,\] \[B=-\text{ }25{{w}^{2}}+15w-

1.	lf \[A=10{{w}^{3}}+20{{w}^{2}}-55w+60,\] \[B=-\text{ }25{{w}^{2}}+15w-10\]and \[C=5{{w}^{2}}-10w+20,\] then \[A+B-C\]is equal to _____.
A.	\[10{{w}^{3}}+10{{w}^{2}}+30w+30\]
B.	\[10{{w}^{3}}+10{{w}^{2}}-30w+30\]
C.	\[10{{w}^{3}}-10{{w}^{2}}-30w+30\]
D.	None of these
Answer» D. None of these

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lf \[A=10{{w}^{3}}+20{{w}^{2}}-55w+60,\] \[B=-\text{ }25{{w}^{2}}+15w-10\]and \[C=5{{w}^{2}}-10w+20,\] then \[A+B-C\]is equal to _____.

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