8. Personal Financial Literacy Diana is
making necklaces. She needs 7 yards of
chain, How much will the chain cost?
Remember, 3 feet = one yard.
y you
162 a foot/

  3402

Step-by-step explanation:

7 yards is 21 feet, so Diana's cost is ...

  (162/ft)(21 ft) = 3402

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Comment on the number

This problem statement doesn't say what the cost units are.

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 answer to this question is 3/19

step-by-step explanation: