The helium balloon you got on your birthday has almost entirely deflated, but there is still a very small amount of 4 He inside with a total mass of 160 amu. How many protons, neutrons, and electrons are present in the balloon (assuming only 4 He is there)

Which changes of state do the labels represent? a: b: c:

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

Ais not a mixture. colloid compound suspension solution