Can line r be parallel To line S and line P be parallel to line Q at the same time explain

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Atrucker had a load of grain containing 2 tons. she unloaded 1 ton and 1,200 pounds at the warehouse. how much grain does she still have left on the truck?

Consider the reaction 2x2y2+z2⇌2x2y2z which has a rate law of rate= k[x2y2][z2] select a possible mechanism for the reaction.