Answer:
1.5 x [tex]10^{6}[/tex]
Step-by-step explanation:
Ok so what you want to know before you start this is that 1.25 x10^6 is really
1250000 you just move the decimal place 6 places back; if it was a -6 you would move the decimal place 6 places forwards.
1,250,000+ 250,000 = 1,500,000
then to convert back to  scientific notation just move to the first number and place the decimal then count the zeros.
EX:
1.500000 --count zeros + the 5 because you moved the decimal in front of it too, and you are left with =
1.5 x 10^6
