The best type of mortgage for her would be a fixed rate mortgage, because it would tell her exactly how much she is paying each month
Scientific notation is just rewritten so that it has a single digit in front of the decimal and that this is multiplied by a power of ten that makes this decimal equal to the original number.
In this case we have 2.67 million. Well a million is equal to 10^6, because 10*10*10*10*10*10=one million.
So in scientific notation you would write:
2.67X10^6
10, 20w, 2w, and we are factors of 20w and 40wz