Help with number 7 please:)

What is the factored form of the following expressions? d^2 – 13d + 36

Triangle knm is what is true about the sides of knm

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%