Which expressions are equal to 6 fifths

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Three times the sum of a number and seven is negative thirty-six. what is the number?

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%