how do i find the answer to 2/3-$1.58
Are you asking what is 2/3 of $1.58?
If so, you should not have put a minus sign between them.
You cannot subtract a number with dimensions (dollars in this case) from a dimensionless number like 2/3.
2/3 of $1.58 is $1.05 and 1/3 cent
That would usually be rounded to $1.05