How do i use two unit mutipliers to convert 310 inches to meters?

What is the first step of an indirect proof of a number that is divisible by two

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%

What is the length of ac in the given triangle?