Not solvable. If you take the first and last equations together, then multiply the last by -1 you get
2g+3h-8j=10
2g+3h-8j=-5
Resulting in
10=-5, which is false, so there is no solution
Answer:
8
Step-by-step explanation:
−4(−2)
A negative times a negative is positive, 4*2 = 8
8

It tells you that over these intervals the balloon is going at a constant speed.