Juan and his little brother Miquel ran around a circular track together. Juan ran on the inner track, which has a radius of 30 feet. Miquel ran on the outer track which has a radius of 40 feet. How much further did Miquel run than Juan after two loops around the track?

Need on this geometry question. explain how you did it.

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

Jonathan puts $400 in a bank account. each year the account earns 6% simple interest. how much interest will be earned in 5 years?