Since you are moving toward the source of the sound, the frequency of the sound will be shifted according to the formula
[tex]f'= \frac{v+v_o}{v} f[/tex]
where
v is the speed of sound (343 m/s)
[tex]v_o[/tex] is the speed of the observer relative to the source, and it is positive when the observer is moving towards the sound (so in this case, [tex]v_o=8 m/s[/tex])
f=1750 Hz is the original frequency of the sound
Plugging the numbers into the equation, we find that the frequency you will hear is
[tex]f'= \frac{343 m/s+8m/s}{343 m/s} (1750 Hz)=1791 Hz [/tex]
