The Numerator is 1, which is the top. The Denominator is the 8. I like to remember (D)own is the (D)enominator.
Answer:
3.456E + 14= 
Step-by-step explanation:
The river discharges
cubic feet of water into the Pacific Ocean each second.
There are 86,400 seconds in one day.
Amount of water discharges each day

Since this differs from what you have, I will explain the scientific notation.
3.456E + 14 simply means 
The options are not well laid out but you can pick the appropriate option.
X=12 because 73-3x=61-2x so add 3x to both to make 73=61+X then subtract 61 from both to get 12=X
the only like-terms are on the right-hand-side, since the left-hand-side has only 1 term anyway.
