6 less than one eighth of y is x

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%

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities

Ahyperbola centered at the origin has a vertex at (-6,0) and a focus at (10,0)