Cual numero falta (-18)+( )=(+6)

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.

How can you find the mean absolute deviation (mad) for this set of data?