Why do many stores have big after-Halloween sales on their Halloween merchandise?

Because after Halloween, they want to get rid of their Halloween merchandise. Once the demand for it is gone, the merchandise won't earn them any more money, and they need to free up room for Thanksgiving and Christmas. The same sale happens after most major holidays.

All stores try to provide their customers with everything they need. It is best to make profit if they know what they need and when. Since people buy a ton of items for Halloween, it is most common sense to prepare after-holiday items. Usually things to help clean up or just a parting gift after a holiday. This allows stores to make more profit on not just the holiday items, but after holiday purchases.

I hope this helps.

-szimbitskyy

hi, i am not sure about this one but i think its d,

hope this !

3. parallelogram

step-by-step explanation:

we turn each of our sides into direction vectors

ab=b-a=(3 - 7, 1 - 0) = (-4, 1)

bc=c-b=(1,6)

cd=d-c=(4,-1)

da=a-d=(-1,-6)

we see how the opposite sides have negated direction vectors; this is characteristic of a parallelogram.   we have congruent sides ab=cd and bc=da with unequal lengths because 1^2+6^2 is different from (-4)^2+1^2.   so it's not a square or a rhombus.  

we check the dot product of direction vectors of adjacent sides.   we have

ab dot bc = -4(1) + 1(6) = 2

that's not zero so the sides are not perpendicular.   we've ruled out rectangle.

the direction vectors indicate two pairs of congruent parallel sides, so we choose parallelogram over trapezoid.