Can anyone me? i'm having trouble.

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%

Use the second shift theorem to find the inverse laplace transform of (e^−3s) / (s^2 + 2s − 3)

What percent of $1.00 are a nickel and a dime?