Mrs. Butler worked on school things Monday afternoon. She spent a total of five hours on school. She graded 236 assignments and created Tuesday's lessons. It took her one hour and twenty minutes to make the lessons. How much time did each assignment take to be graded?

1 minute and 4 seconds

Step-by-step explanation:

5 hours - 1hour 20mins = 3hours 40 mins

3 hours 40 mins = 220 minutes

236 / 220 = 1.07272... x0.6 x 100 = 64.36... seconds

1 minute and 4 seconds

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.

step-by-step explanation: