Distance between (-5,-6) and (5,6)

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

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%

Find the distance between the point (-3,-4), and (see the picture below)