Need answer for 4,5,6,7

4. If the initial value of momentum is 276 kg . - and experiences a Amomentum of 24 kg . - what is the final momentum? kg m/s 5. After experiencing a change of position of 20 m, a person is now located at 15 m. What was their initial position? 6. An object is lowered down to the floor from 63 meters above the surface of the floor. What is Aheight? 63 m 7. If three people are at a party and after 3 hours there are 45 people in attendance. What is An at the party? (n represents the number of people) 42 people What is At for the question? (t represents time in seconds) answer in scientific notation X10 seconds