Class 9 Math Ex 2.4 (Q6, Q7 & Q8) Complete Solution | Word Problems | PCTB New Book 2025

Assalam-o-Alaikum, dear students! Welcome to Dr. M. Yousaf's official lecture for 9th Class Mathematics, fully aligned with the Punjab Curriculum & Textbook Board (PCTB) New Syllabus 2025. In this video lecture, we completely solve Questions 6, 7, and 8 from Exercise 2.4 of Unit 2. Learn how to apply logarithmic formulas to real-world scenarios, including measuring earthquake magnitudes, calculating investment double-time models, and determining temperature changes during mountain hiking! TOPICS COVERED: Exercise 2.4 Question 6: Earthquake Magnitude Formula Application Exercise 2.4 Question 7: Investment Compound Growth and Doubling Time Exercise 2.4 Question 8: Mountain Temperature Altitude Decrease Model TIMELINE / CHAPTER TIMESTAMPS: 00:00 – Introduction to Exercise 2.4 Word Problems (Q6, Q7, Q8) 01:00 – Question 6: Calculating Earthquake Magnitude given Amplitude and Reference Amplitude 04:24 – Question 7: Solving Investment Growth Equation to Find Doubling Time using Logarithms 11:15 – Question 8: Calculating Mountain Temperature at 500 Meters Altitude using Exponents Don't forget to Like, Share, and Subscribe to @Dryousaf001 for upcoming lecture videos! #9thMath #Exercise2_4 #LogarithmWordProblems #EarthquakeMagnitude #PCTB2025 #PunjabBoard #DrMYousaf