The number of different bond angles for the most polar isomer of pbr2f3 is?
a. 7
b. 6
c. 5
d. 8

The number of different bond angles is 6 and here you have the different angles:
Br(ax)-P-Br(eq) greater than 90 degrees (axial to equatorial) 
Br(eq)-P-F(ax) greater than 90 degrees (equatorial to axial) 
Br(ax)-P-F(eq) less than 90 degrees (axial to equatorial) 
F(ax)-P-F(eq) less than 90 degrees (axial to equatorial) 
F(eq)-P-F(eq) less than 120 degree (equatorial) 
Br(eq)-P-F(eq) greater than 120 degrees (equatorial) 

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