Your model train has one engine and eight train cars. find the total number of ways you can arrange the train. ( the engine must be first)

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.