Answer:
The expression 40n+15p shows the amount paid by the newspaper if Alexis and Paige are hired together.
Step-by-step explanation:
Given that:
Alexis charges $25 for each news story and $5 per picture.
Let,
n represent the number of news stories and p represent the number of pictures.
Alexis' total charges = 
Paige charges $15 for each news story and $10 per picture.
The variables will be same.
Paige's total charges = 
Alexis and Paige's charges will be added if newspaper hire them together.
Total charges paid by newspaper = 
Hence,
The expression 40n+15p shows the amount paid by the newspaper if Alexis and Paige are hired together.
Answer:

Where t represent the time in years
For this case this model follows the general model given by:

Where a = 140 represent the initial amount of bisons and y the number of bisons after t years and b = 2.7 represent the growth rate
For this case we want to find the value of y when t =30, and if we replace the value of t =30 in our function we got:

And if we round to the nearest whole number we got 189 bisons after 30 years
Step-by-step explanation:
For this case we have the following function given:

Where t represent the time in years
For this case this model follows the general model given by:

Where a = 140 represent the initial amount of bisons and y the number of bisons after t years and b = 2.7 represent the growth rate
For this case we want to find the value of y when t =30, and if we replace the value of t =30 in our function we got:

And if we round to the nearest whole number we got 189 bisons after 30 years
The numbers are 7 and 17
twice of 7 is 14 and 3 + 14 = 17