Find 50% of 2/3 of 0.12 and write the answer as a decimal

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%

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?