Andy estimated that he would need 76 feet of lumber for a tree house project. he later found that the actual amount of lumber needed was 65 feet. what was the percent error of andy's estimation?

The sum of two numbers is 86, and their difference is 20. find the two numbers

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

The taxi fare in gotham city is $2.40 for the first 1 2 12 mile and additional mileage charged at the rate $0.20 for each additional 0.1 mile. you plan to give the driver a $2 tip. how many miles can you ride for $10?