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Determine the maximum r-value of the polar equation r =3+3 cos 0

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Ahot-air balloon is 11.0 m above the ground and rising at a speed of 7.00 m/s. a ball is thrown horizontally from the balloon basket at a speed of 9.00 m/s. ignore friction and air resistance and find the speed of the ball when it strikes the ground.