At a clothing store sale, a shirt costs $15 more than a tie. The total cost of 3
shirts and 3 ties is $99. Which system of
equations can be used to determine the
cost in dollars of a shirt, s, and the cost in
dollars of a tie, t?

I believe the answer is G

Step-by-step explanation:

t stands for tie and s stands for shirt, subtracting money from the tie doesn't fit the equation correctly, lowering the answers to F and G. In the lower equation of F it shows s + t= 99, but that is not true, making the answer G

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.

it would more likely be bald eagle because its has more in the box so about 75%.

step-by-step explanation: