How many different "words" can be made from the given word by rearranging the letters? DIGIT I don't need the word themselves I just need the amount

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9