How many degrees is angle c?

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%