Which best describes the sides of all trapezoids?
a.
opposite sides are parallel.
b.
all sides are the same length.
c.
only one pair of sides is parallel.
d.
all sides are different lengths.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

what is the answer to this

it's undefined because anything multiplied by 0 is 0. that said, 7 days is 168 hours