Question

Math questions
1. 2 numbers with GCF of 18 and LCM of 180

3. Find x and y: 81^x= 1/729^y

4. If the speed of light is 1.5*10^11 m/sec and the sun is 13*10^8 km away from the earth. How long does it take for light to reach earth( use scientific notation )

Answer 1

Answer:

1.2

steps to find LCM

• find the prime factorizaton of 18
• 18=2×3×3
• find the prime factorizaton of 180
• 180=2×2×3×3×5
• multiply each factor the greater number of times it occurrs in steps (1),(2) above to find LCM:
• LCM=2×2×3×3×5
• LCM=180