Twelve square tiles, each measuring 6 4/5 inches on a side, are laid side by side. What is the total width of the tiles?

81.6 inches or  

Step-by-step explanation:

Given : There are 12 square tiles .

To Find: What is the total width of the tiles​

Solution :

Dimension of each square tile =

Thus the width of 1 tile =  

So, total width for 12 tiles =  

                                         =  

Hence the total width of tiles is 81.6 inches or  

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.