A hat cost $20. A customer has a 100-dollar bill.
The seller doesn't have change so he gets it from his neighbor.
After the customer leaves, they found out that the $100 was fake.
The seller returns the $100 to the neighbor.
How much money did the seller lose?

What is the 12th term of b(n)=-4-2(n-1)

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?

Sioux co. replaced the roof on its existing building, therefore increasing the building's life by 10 years. the cost of the roof is considered a(n):