Answer:
You should use this for work related questions :/
Sound waves travel faster through <em>solids</em> than they do through gases or liquids. <em>(C) </em>They don't travel through vacuum at all.
Example:
Speed of sound in normal air . . . around 340 m/s
Speed of sound in water . . . around 1,480 m/s
Speed of sound in iron . . . around 5,120 m/s
Headphones, refrigerator magnets, and compasses
Hope that was helpful.
The correct answer is A, 2x^3 - x^2 +3x +7