I need help with this some people say they know D is right giving brainliest if u get it right TWO ANSWERS

A6.10 m nacl can be made by adding [x]g of nacl to a container and making the volume of water up to the 1.00 l line

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?