Two Forces $F _ { 1 } \text { and } F _ { 2 }$

Multiple Choice

Two forces $F _ { 1 } \text { and } F _ { 2 }$ with magnitudes 8 lb and 12 lb act on an object at a point P as shown in the figure. Find the magnitude of the resultant force F acting at P. Round the result to the nearest tenth.

A) $$17.7 \mathrm { lb }$$
B) $13.7 \mathrm { lb }$
C) $15.7 \mathrm { lb }$
D) $19.7 \mathrm { lb }$
E) $11.7 \mathrm { lb }$