Calculate $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) }$

Calculate $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) }$ , and $\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) }$ when defined. $f ( x , y ) = 960 - 13 x + 6 y + 7 x y$

A) $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = - 22$ , $\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = - 34$
B) $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = 110$ , $\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = 136$
C) $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = 28$ , $\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = 5$
D) $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = 22$ , $\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = 34$
E) $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = 34$ , $\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = 22$

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