Answer:
3.456E + 14= [tex]3.456X10^{14[/tex]
Step-by-step explanation:
The river discharges [tex]4X10^6[/tex] cubic feet of water into the Pacific Ocean each second.
There are 86,400 seconds in one day.
Amount of water discharges each day
[tex]=4X10^6X86400\\=345600000000\\=3.456X10^{11[/tex]
Since this differs from what you have, I will explain the scientific notation.
3.456E + 14 simply means [tex]3.456X10^{14[/tex]
The options are not well laid out but you can pick the appropriate option.