You reverse the inequality symbol if you divide or multiply by a negative number in order to solve the inequality.
5/8 times what=3 and 3/4
convert 3 and 3/4 to improper
3 and 3/4=3+3/4=12/4+3/4=15/4
5/8 times what=15/4
times both sides by 8/5
what=120/20
what=12/2
what=6
6 times
The expression:

gives the distance traveled by the aircraft in t hours, so, for t = 6:
Answer: Yes it is a function.
Step-by-step explanation: When trying to find out, you put it into a calculator and can tell by the line if it is a function.