Mary and four friends shared 1/4 gallon how much did eachfriend get equally

0.05  or  1/20

Step-by-step explanation:

Since there are 5 people, you need to divide 1/4 by 5.

1/4 can also be written as 0.25.

0.25 / 5 = 0.05

So, each friend will get 0.05  or  1/20!

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.

the solution is h=10 because you add 9 to each side of the equation.