please write every answer with question number

Question 1 (5 points) Define What significant figures mean:Question 2 (5 points) Discuss Significant Rules:Question 3 (2 points) What is the number of significant figures for the following, and why? (specify which Rule)? 2.2900 x 10^3Question 4 (2 points) What is the number of significant figures for the following, and why? (specify which Rule)? 480 RAQuestion 5 (2 points) What is the number of significant figures for the following, and why? (specify which Rule)? 167.1Question 6 (2 points) What is the number of significant figures for the following, and why? (specify which Rule)? 0.0025Question 7 (2 points) What is the number of significant figures for the following, and why? (specify which Rule)? 152