one million seconds
If there was no 'a' the expression would make no sense. 'in million years' does not make sense.
well it depends on how long you keep that million dollars in the bank if you kept it in the bank for 3 days you would have one more dollar than you did
It is the time taken by the earth to make a million orbits of the sun.
You need to be very clear to distinguish between earn and make. People is some jobs can make 1 million pounds in a year or less but that does not mean they earn it!
million of years
A million billion years
The cost to make 1 million else would depend upon the type of valve that is being made. If they fell being made costs one dollar it would then cost $1 million to make 1 million of them.
4634 million is 4.634 billion. That would make it 4,634,000,000.
10 million years
It means that there was a "one in a million" chance that she would make it and she did.