1. abcd is a rectangle. bd is a straight line that cuts the rectangle into equal halves. the ratio of the area of p to the area of q is 2 : 5, and the ratio of the area r to the area of s is 4 : 3. the area of s is 9 square centimeters.
a) find the ratio of the area of r to the area of the rectangle. the area of the rectangle

S is 3 parts of R, or 9.  9 is 3/4 of 12, so R is 12. 12 plus 9 is 21, which is half of the full area of the rectangle. The area of the rectangle is 42 square centimeters. Now, we need to find what R is to the whole rectangle. We know that R is 12 square centimeters, and that the rectangle is 42 square centimeters. That ratio is 12 to 42. If it is simplified, that would be 6 to 21. If it is simplified further, you find that it is 2 to 7. Hope this wasn't too confusing, and I hope that I helped :)

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table