Explain how mental math can be used to estimate a 15% tip on a taxi ride that costs $23.25

plz explain, and plz show work

34 cup. a serving of vegetable soup is 23 cup. the restaurant sold 20 servings of chicken noodle soup and 18 servings of vegetable soup. how many more cups of chicken noodle soup did they sell than cups of vegetable soup?

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17

20.ju inces. which ordered pair is a viable solution if x represents the number of books he orders and y represents the total weight of the books, in ounces? (-3,-18) (-0.5, -3) (0,0) (0.5, 3)