Explain how to get the variable alone in the equation 13.7 + r = 21.4

Which of the following questions is a statistical question? (2 points) how many professional sport leagues are there? where do the professional sport leagues play? how many hours of professional training took place over the weekend? how many hours do you spend each week training for a sports league?

What is the volume of a rectangular prism if the length is 10.4 mm the width is 5 mm in the height is 8 mm

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?