Add. Simplify, if possible.
-$$\frac { 4 } { r } + \frac { 9 } { r - 7 }$$
A) $\frac { 13 r - 28 } { r ( 7 - r ) }$
B) $\frac { 28 r - 13 } { r ( r - 7 ) }$
C) $\frac { 13 r - 28 } { r ( r - 7 ) }$
D) $\frac { 28 r - 13 } { r ( 7 - r ) }$

Question

Quizplus · Accepted Answer

To add the fractions $\frac{4}{r} + \frac{9}{r-7}$, find a common denominator, which is $r(r-7)$. The result is $\frac{4(r-7) + 9r}{r(r-7)} = \frac{4r - 28 + 9r}{r(r-7)} = \frac{13r - 28}{r(r-7)}$.

Add Simplify, If Possible 4r+9r−7\frac { 4 } { r } + \frac { 9 } { r - 7 }r4​+r−79​

Add Simplify, If Possible $\frac { 4 } { r } + \frac { 9 } { r - 7 }$