Write the rule for the pattern1,5,9,13,17

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

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%

Abook store is having a 30 perscent off sale. diary of the wimpy kid books are now 6.30 dollars each what was the original price of the books