With tolling 2 standard sice what is probability of rolling doubles or sum. of 8

What is the binomial expansion of (2x-3)^5

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

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%