Cole purchased a bag of peanuts priced at $1.55 with a sales tax rate of 3.3%. What was the purchase price?

$1.60

Step-by-step explanation:

100% represents the marked price thus

100% + 3.3% = 103.3% represents the purchase price

100% $1.55

1%$1.55 / 100 = $0.0155

103.3%$0.0155 x 103.3 = $1.60115

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: