3x-9=2x+4
3x-9+9=2x+4+9
3x=2x+13
3x-2x=2x-2x+13
x=13
Check:
3(13)-9=2(13)+4
39-9=26+4
30=30
Yes
The rule to check if a triplet of numbers can represent the sides of a triangle is the following: the sum of the length of two sides must exceed the third one.
This happens for all possible couples in your case:



9/4
well, 4 times 2 is 8, there would be a quarter left over
answer: 2 1/4
so it would be 2 and a quarter.
Hope this helped :)
Answer:
d) 
Step-by-step explanation:
requires 
requires 
requires 
So, total amount of gasoline required for the trip is
.