If a teacher has 25 student's and wants to give three to each student .how many packages will she need? (markers come in packages of 8

So 8 x 3= 24. We know the answer should be around 9 I know this because  3 x 3= 9.

8 x 9= 72 and 25 x 3= 75 Now you should do 8 x 10 you will  get 80 and that will be around 5 left for each student. The teacher will need 10 packages of markers.

Happy studying ^-^

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.

ddsf

step-by-step explanation:

dfs