W= 7
38=2w+2(12)
/
38=2w + 24
-24 -24
14=2w
divid by 2 divid by 2
7=w
By using the rule -b/2a —> 12/-6= -2
The least common multiple is the smallest term that can be divided to both terms without any remainder. For the two terms 8c^4 and 6c^2, you can determine it into two part. First, you find the LCM for 8 and 6. You find the prime number that is common between the two. That would be 2. For the variables c^4 and c^2, the 'prime variable' is c. Therefore, the least common multiple for 8c^4 and 6c^2 is 2c.
.6 hours. We take the time per hour of sound, which is 1,200 from scientific notation, and compare it to our given, which is 720 from scientific notation. Since we want to know how long it takes for sound to travel for 720 km, we divide 720/1,200 to give us .6.