Brian would like to attend camp with his friends this summer. His parents told him that he would have to
earn the money for the camp himself. Brian has decided
that he will mow the lawn each week to earn money. If
his parents give him $35.00 every time he mows the
lawn, how much money will he have after 8 weeks?

280

Explanation? $35.00 × 8 weeks = $280.00

                       So BRIAN will have 280 dollars by 8 weeks

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:

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