Astationary shop has a sale on address books and calendars. two of the address books and one calendar cost a total of $10. one of the address books and three calendars cost a total of $15. how much does one calendar cost ? a) $6 b)$3 c)$1 d) $4

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.