Which choice does not describe a parallelogram?
a. a quadrilateral that has diagonals that bisect each other.
b. a quadrilateral that has diagonals that do not bisect each other.
c. a quadrilateral that has opposite sides that are both congruent and parallel.
d. none of the above

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Ineed me i stuck and i don’t want to get it wrong

Which value of y will make the inequality y< -1 false?