For this case, the first thing we must do is find the multiples of the coefficients.
We have then:
- <em>42: 1, 2, 3, 6, 7, 14, 21, 42
</em>
- <em>56: 1, 2, 7, 8, 28, 56
</em>
We observe that the biggest common factor is given by 7.
Therefore, by rewriting the expression we have:

Answer:
An equivalent expression is given by:

6 + x = 20
- 6 - 6
x = 14
14 plus six gives you 20.
Answer: Sound waves entering a warmer air means that the kinetic energy of the air particles will increase and thus the vibration of particles will be increased and thus the speed of transmission of sound waves increases.
Step-by-step explanation: