Pls help and if u dont have the answer but still answer i will report u

Most short-period comets do not have randomly oriented orbits because

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after 1 hour? when will the pool water be 0.006% chlorine?