Fred had $165 dollars to get a shirt ,he got a 15% discount and and additional sales tax of 7,5%.what's his total?

Which one ? is the answer and how to find this answer

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.

The area of a circle is equal to 1 dm². find the radius of the circle.