given the following sets.

a = {0, 1, 2, 3}
b = {a, b, c, d}
c = {0, a, 2, b}

find b c.
{0, 1, 2, 3}
{a, b, c, d}
{0, a, 2, b}
empty set
{a, b, c, d, 0, 2}

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

What is the name of a polygon that has four congruent sides and theses angle measures 60,120,60,120?