In science i really need answers in the book for my assignments.
1) which is neutral? neutron, proton, both a & b, or neither a nor b
2) it is a basis for an atom's individuality? neutron, proton, both a or b, or neither a nor b
3) it is responsible for the mass of an atom? nuetron, proton, both a or b, or neither a nor b

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.