"a quadrilateral is a trapezoid if and only if it has exactly one pair of parallel sides."

if this statement is true, then which of the following statements must also be true?

a. a trapezoid has exactly one pair of parallel sides if and only if it is a quadrilateral.
b. a quadrilateral has exactly one pair of parallel sides if and only if it is a trapezoid.
c. a quadrilateral is not a trapezoid if and only if it has exactly one pair of parallel sides.
d. a quadrilateral does not have exactly one pair of parallel sides if and only if it is a trapezoid.

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What is the solution to the equation e3x=12? round your answer to the nearest hundredth

Use the spider tool located on page 1 of this activity to draw a 12-pointed star for the new logo. (hint: if the spider rotates 360 degrees -- or 720 degrees or 1080 degrees -- she will be facing in the same direction in which she started. when the spider is done drawing, you want her to be facing in the same direction in which she started. she'll be making 12 rotations, all the same size, so each rotation must be some multiple of 360/12 = 30 degrees.) urgently. been stuck on this problem for around 45 minutes now.! it should be easy if you're smart enough