Sig Figs Help please?

Question

How many sig figs are in this number?

-17.90000

I'm thinking 7 because all final zeros with a decimal point are significant right?

Also,

is 1/5 [0.2] considered an exact number?

I'm doing a calculation and my answer rests on whether one fifth's conversion into 0.2 would be considered an exact number.

Thank you for the help.

Answer 1

Yes, 7 sig figs

Yes, exact number