A researcher was interested in the mean wait time in South Carolina emergency rooms. 3 emergency rooms were randomly selected and all of the wait times were entered into the data set. This is an example of sampling.

Select one:
simple random
stratified
convenience
cluster

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

Answer asap! show all work! find the number of complex roots, the possible number of real roots and the possible rational roots of the polynomial function. then, solve for all roots. x^3 + 2x^2 + 3x + 6 = 0