In quadrilateral ABDC, AB ∥ CD. Which additional piece of information is needed to determine that ABDC is a parallelogram? AB ≅ CD
AC ≅ BD
AB ⊥ BD
CD ⊥ BD

Select true or false to tell whether the following conditional p q is true or false. use the truth table if needed. if a week has seven days, then a year has twenty months.

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Which expression is not a polynomial?