$24
(ignore this i don’t have enough characters )
Solution: We are given:
Predicted Sales by Sameera ![=38](https://tex.z-dn.net/?f=%3D38)
Actual Sales by Sameera ![=28](https://tex.z-dn.net/?f=%3D28)
Now to find the Percent error, we have to use the below formula:
![=\frac{|38-28|}{28} \times 100 \%](https://tex.z-dn.net/?f=%3D%5Cfrac%7B%7C38-28%7C%7D%7B28%7D%20%5Ctimes%20100%20%5C%25)
![=\frac{10}{28}\times 100 \%](https://tex.z-dn.net/?f=%3D%5Cfrac%7B10%7D%7B28%7D%5Ctimes%20100%20%5C%25)
![=35.71 \%](https://tex.z-dn.net/?f=%3D35.71%20%5C%25)
Therefore, the percent error is
The function represents exponential growth (since the exponent is positive).
The percentage increase is, if I'm not mistaken, 181.3% (since 710 is just a constant, we don't need to worry about that - it won't affect the growth rate of the function)
Let:
x = Chemistry textbooks sold
y = Physics textbooks sold
The textbook store sold a combined total of 260, so:
![x+y=260](https://tex.z-dn.net/?f=x%2By%3D260)
The number of chemistry books sold was three times the number of physics textbooks sold, so:
![x=3y](https://tex.z-dn.net/?f=x%3D3y)
Let:
![\begin{gathered} x+y=260_{\text{ }}(1) \\ x=3y_{\text{ }}(2) \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20x%2By%3D260_%7B%5Ctext%7B%20%7D%7D%281%29%20%5C%5C%20x%3D3y_%7B%5Ctext%7B%20%7D%7D%282%29%20%5Cend%7Bgathered%7D)
Replace (2) into (1):
![\begin{gathered} 3y+y=260 \\ 4y=260 \\ y=\frac{260}{4} \\ y=65 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%203y%2By%3D260%20%5C%5C%204y%3D260%20%5C%5C%20y%3D%5Cfrac%7B260%7D%7B4%7D%20%5C%5C%20y%3D65%20%5Cend%7Bgathered%7D)
Replace the value of y into (2):
It equals 10 000
10 000 ×10 000=100 000 000