i need help with these 4 questions on my math homework


So,
We're going to sum the following:
[tex]1.25\cdot10^6+250000[/tex]This is the same to write:
[tex]1250000+250000=1500000[/tex]And, the result can be expressed as:
[tex]1500000=1.5\cdot10^6[/tex]So the answer is C.