Apply the distributive property to the numbers 35 and 55 so they are being mulitplied by the greatest common factor

I'm guessing it's asking you to multiply 35 and 55 with the greatest common factor, which in that case the greatest common factor is 5. So it would look something like 5(35+55), and when you multiply using the distributive property it would end up being 175 + 275 (because (5x35) + (5x55)). I hope this helps, but I'm not 100% sure what the question is asking; this is just what I understand from it.

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