I need help with homework questions

Classify each polynomial by its degree and by its number of terms.

Don't know how to find x given these segment lengths

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%