Answer:
i dont know how to do it231
Step-by-step explanation:
1123234
At z= 12:
z/4 -8z+ 2(z-5)
= 12/4 -8*12+ 2(12-5)
= 3 -96+ 2*(7)
= -93+ 14
= -79
The correct answer is A. -79~
Answer:
![a = 3.7464](https://tex.z-dn.net/?f=a%20%3D%203.7464)
![b = 16](https://tex.z-dn.net/?f=b%20%3D%2016)
Step-by-step explanation:
Given
See attachment for complete question
Required
Express the answer in ![a * 10^b](https://tex.z-dn.net/?f=a%20%2A%2010%5Eb)
From the question, we have:
![People = 4.46 * 10^9](https://tex.z-dn.net/?f=People%20%3D%204.46%20%2A%2010%5E9)
breath/person in a year
The number of breath is calculated by:
![Overall = People * Breath](https://tex.z-dn.net/?f=Overall%20%3D%20People%20%2A%20Breath)
So, we have:
![Overall = 4.46 * 10^9 * 8.4 * 10^6](https://tex.z-dn.net/?f=Overall%20%3D%204.46%20%2A%2010%5E9%20%2A%208.4%20%2A%2010%5E6)
Reorder
![Overall = 4.46 * 8.4* 10^9 * 10^6](https://tex.z-dn.net/?f=Overall%20%3D%204.46%20%20%2A%208.4%2A%2010%5E9%20%2A%2010%5E6)
![Overall = 37.464* 10^{9+6}](https://tex.z-dn.net/?f=Overall%20%3D%2037.464%2A%2010%5E%7B9%2B6%7D)
![Overall = 37.464* 10^{15}](https://tex.z-dn.net/?f=Overall%20%3D%2037.464%2A%2010%5E%7B15%7D)
Using scientific notation
;
The value (a) must be in the following interval ![0 \le a \le 1](https://tex.z-dn.net/?f=0%20%5Cle%20a%20%5Cle%201)
So, we have:
![Overall = 3.7464 * 10 * 10^{15](https://tex.z-dn.net/?f=Overall%20%3D%203.7464%20%2A%2010%20%2A%2010%5E%7B15)
![Overall = 3.7464 * 10^{16](https://tex.z-dn.net/?f=Overall%20%3D%203.7464%20%2A%2010%5E%7B16)
By comparing the above with: ![a * 10^b](https://tex.z-dn.net/?f=a%20%2A%2010%5Eb)
![a = 3.7464](https://tex.z-dn.net/?f=a%20%3D%203.7464)
![b = 16](https://tex.z-dn.net/?f=b%20%3D%2016)