What determines the atomic mass of an element?

a.
the sum of the neutrons and the electrons

b.
the sum of the protons and electrons

c.
the sum of the ions and isotopes

d.
the sum of the protons and the neutrons

Density of salty water as compared to the density of pure water is(a) is less(b) is always equal(c) is always more(d) may be less or more

What is the length x of the side of the triangle below? (hint: use the cosine function)

Athermometer is removed from a room where the temperature is 70° f and is taken outside, where the air temperature is 10° f. after one-half minute the thermometer reads 60° f. what is the reading of the thermometer at t = 1 min? (round your answer to two decimal places.) ° f how long will it take for the thermometer to reach 30° f? (round your answer to two decimal places.)