If the Circumference of a circle is 12 cm, what is the circles Diameter? Please help thankss!

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

What situation is an example of an observational study

Which one is the correct answer, and why?