Help ASAP give brainest

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Find the area of the unshaded square

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%