Forty and five hundred sixty seven thousandths written in standard form

Could somebody me with this radical simplification?

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

How do u write a function for the reflection across the y axis