Molly earned $12 per hour babysitting. she babysat for 9 hours over the weekend. then she earned another $85 cleaning her aunt ‘s house. how much money did molly earn in all?

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?

The area of a circle is equal to 1 dm². find the radius of the circle.