Use a non-traditional item or things to recreate a closed or open circuit. Don't limit your creativity!! You can use paint, food, your fingers, brushes, spoons or whatever you can find at home and upload a picture when you are done!

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

Make them both to where they have the denominator of 18that makes 3/2 equal 27/18 and 1/9 equal 2/18so now you have  27/18x+5=2/18subtract 5 from the other sideso now you have 27/18x+2/18-5then subtract 2/18 from 27/18 to get 25/18x=-5then divide 25/18 by -5 and your answer will be  -5/18

Ok what do you need with

The anwser is: wave a has a greater pitch and frequency.