What is the answer to this problem?

How many different ways can you make change for $.50 using only nickels, dimes, and quarters?

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?