For the parentheses please

Can any one me with the answers to these questions asap?

Solve this and show you’re work step by step ! -5 3/4+3h< 9 1/4 -

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%