2) х – бу = -42
x – бу = 54

I need help solving this

What is the rotational symmetry of a wheel

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%

Can some one explain this i got sent this. is this a threat i’m scared