Quadrilateral ABCD (below) is a parallelogram . What is BC?

What is the factored form of the following expressions? d^2 – 13d + 36

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables

Suppose the equation ||x-a|-b|=2008 has 3 distinct real roots and a not =0. find the value of b.