<u><em>Answer:</em></u>
s > 768 miles/hour
<u><em>Explanation:</em></u>
<u>We are given that:</u>
1- speed of sound is 768 miles/hour
2- sonic booms are created ONLY WHEN the speed of object (s) is greater than the speed of the sound
<u>This means that:</u>
s < 768 miles/hour ...............> no sonic boom is created (false)
s = 768 miles/hour ................> no sonic boom is created (false)
s > 768 miles/hour ................> sonic boom is created (true)
Since we are looking for the true equation of creation of sonic waves, it would be only the last one (s > 768 miles/hour)
Hope this helps :)