Molly biked 12 miles there's a marker at start and end and marker at each mile. how many markers are there

Can someone answer this question? : )

Write the expression as a single natural logarithm. 2 in a - 4 in y

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%