If an isotope of uranium, uranium-235, has 92 protons, how many protons does the isotope uranium-28 have?

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal